NORAD Desig.  Common name, flash period, brightest known magnitude, and other notes
----- ------- -----------------------------------------------------------------------------------------
03692 69-013B Transtage Titan 3C, detected flashing by Tony Beresford (AB)
04069 69-069B Atlas Centaur R/B, AB
06796 73-058A Intelsat 4-F7, AB
10778 78-035A Intelsat 4A-F6, p=164.5 +5 20040918, Mike Waterman (MW)
11648 79-105A Gorizont 3, p=126.6 19981110; p=156.4 19981115, (MW)
11669 80-004A Fleetsatcom 3, p=67.1 (asymm dbl flashes) +4.5 20041016 EC
11841 80-049A Gorizont 4, p=148 20000911 +7, Steve LaLumondiere (SDL); discovered by Jay Respler (JHR)
12032 80-085A Cosmos 1217, p=11.5 +1.5 19980120 Mike McCants (MM)
12089 80-098A Intelsat 502, p=261 20011108 Ed Cannon (EC)
12545 81-057B APPLE, p=17.26 +2.5 20040303 DG; discovered by Kevin Fetter (KF)
13056 82-009A Ekran 8, p=92.8 +7 19980509, Jason Hatton (JPH)
13092 82-020A Gorizont 5, p=23 +12 1994 Dec, JHR
13431 82-082A Anik D1 (Telesat 6), p ~ 6? +12 1998 Nov JHR; later Michel Jacquesson (MJ)
13624 82-103A Gorizont 6, flashing?
13652 82-110C Anik C3 (Telesat 5), p=1 11.3 19981116 JHR
13669 82-113A Raduga 11, p=72.54 +7.0 20040323 DG
14182 83-070A Cosmos 1481, p=16.3 20000227, +3 wow 19960719 MM
14328 83-094A RCA Satcom 2R, p=46.241 +6 20020929, MW
14532 83-118A Gorizont 8, p=19/56 1995 Feb JHR
14985 84-049A Chinasat 5 (Spacenet 1), p ~ 291 20010428 EC, Ron Lee (RGL) - mag similar to SBird A
15385 84-114A Spacenet 2, p ~ 96.5 +4 20021229 EC
15484 85-007A Gorizont 11, 19980517  p=29.6, MW
15677 85-035A GStar 1, p=55.36 +3.5 20030902, EC (10 mins earlier each night)
15994 85-076C ASC 1, p=153.99 +1 20030415 DG  
16101 85-087A Intelsat 512, p=21.8 +3.5 20020726, EC
16482 86-003B Satcom K1 RCA, p=28.7 +12 19980723, Kurt Jonkheere (KJ)
16769 86-044A Gorizont 12
17046 86-082A Raduga 19, p=26.52 +6.5 20031118 DG; discovered by SDL
17083 86-090A Gorizont 13, p=85.56 20040322 +7.5 DG, discovered by JHR; brightest mag: +6.5
17969 87-040A Gorizont 14, p=87.62 20031219 DG, +4 Paul Gabriel (PG)
18570 87-095A TVSat 1, p=23.2 20010917, EC
18631 87-100A Raduga 21, p ~ 153 20030225, DG; but (p ~ 124; synch.), (observed from USAF Maui site's Contrast Mode Photometer)
18951 88-018A Spacenet 3R, p=32.9 20020403 Ron Welch (RW)
19017 88-028A Gorizont 15, p=16.01 20030910 DG +3, discovered by JHR
19217 88-051C PAS 1, p=34.2 +4.5 20040229 discovered by RW
19397 88-071A Gorizont 16, p=101.8 +7.5 20040307 DG; +3.5 RW
19483 88-081A GStar 3, p ~ 90? 20020601 EC; synch., +4 SDL
19596 88-095A Raduga 22, 20010829 p=98.8, MW
19621 88-098A TDF 1, p ~ 31 20000227 EC, +2.5 Don Gardner (JDG); +2 RM, 12 mins later/night, Rick Baldridge (RB), one-power, +2 to +3
19765 89-004A Gorizont 17, p=36.60 20031003 DG; brightest mag: +3.5 MM
19919 89-027A Tele-X, p ~ 141.3, +4.5 20020202 Russ Bessom (RB); p ~ 196, +2 20000902 EC; 20030819 not easy
20040 89-041A Superbird A, p=11.32 20020913 +3 Leo Barhorst (LB) 
20066 89-046A DSP 14, USA 39 p=02.5 +7 EC 20030413 (was 98001)
20168 89-062A TVSAT 2, p=119.12 20040324 +5 two flashes sep. by 4.8 sec MW; discovered by MW
20263 89-081A Gorizont 19, p=883.9 20030409 MW; discovered by MW
20705 90-063A TDF 2, p=21.6 20020726, EC
20770 90-077A BS-3A (Yuri 3A), p=95.7 20021124 MM, sometimes bright (+2), complex!
20923 90-094A Gorizont 21, 20011109 p=114.6, MW
20929 90-095A DSP 15, Rainer Kracht (RK)
21132 91-014A Raduga 27, p=64.6 +5 20030207 Björn Gimle (BG)
21533 91-046A Gorizont 23, p=55.77 20030105 EC, +5 JPH
21668 91-060A BS/Yuri 3B, p=136 20020223 EC, +5 MM
21759 91-074A Gorizont 24, p ~ 91 20010425 EC, +4 RM, +8 MM
21789 91-079A Cosmos 2172, p=146 19991027 +4 EC
21805 91-080B DSP F16, +7 Daniel Karcher (USA 75; c/o RK), +4.5 RK
22205 92-072A Galaxy 7, p=204.5 +3.0 20031018 EC
22245 92-082A Gorizont 27, p=83.3 +5 20040229, discovered by MW
22253 92-084A Superbird A1
22557 93-013A Raduga 29, +6 RK
22694 93-039A Galaxy 4, spinning since May 19, 1998
22907 93-072A Gorizont 29, p=79.36 20040227 discovered by MW
22927 93-077A Telstar 401, p=100.48 20040303 +3.5 DG; synch.; can flash to zero magnitude!
23108 94-030A Gorizont 30, p=101.7 +4 20041006 MW
23168 94-038A Cosmos 2282, p=18.47 +6 20030414 DG; brightest +4
23670 95-049A Telstar 402R, p=?, 20031205 KF
24315 96-054A GE 1, p=20 +11.8 19970712 JHR
24820 97-027B Insat 2D, p=61.8 +5.5 20030902 EC; brightest: +4.5 EC
27712 03-012B Milstar 6 Centaur, p=1.6 +9 20030413 MM
90002 98-789A Unk 981015 p=16.65 +7.5 20030801 EC & MM; (originally 98003)
90003 99-503A Unk 990103
90005 99-804A Unk 991031
90007 00-653A Unk 000601, p ~ 54 20001027 +4.5 EC, +4 Geoff Chester; lost to amateurs
90008 00-838A Unk 001203, p=2.38 RK
98002         Unk 980731 lost to amateurs

Sources:

Ed C. data
PPAS of Belgian Working Group Satellites
Tony Beresford
Steve LaLumondiere
Mike Waterman
Ron Welch
Messages on SeeSat-L archive:

  http://satobs.org/seesat/Dec-1998/0249.html
  http://satobs.org/seesat/Dec-1998/0253.html
  http://satobs.org/seesat/Aug-1999/0192.html
  http://satobs.org/seesat/May-1999/0288.html
  http://satobs.org/seesat/Mar-2000/0018.html
  http://satobs.org/seesat/Mar-2000/0027.html
  http://satobs.org/seesat/Apr-2000/0053.html
  http://satobs.org/seesat/Aug-2000/0042.html
  http://satobs.org/seesat/Oct-2000/0102.html
  http://satobs.org/seesat/Oct-2000/0370.html
  http://satobs.org/seesat/Jan-2002/0117.html

See also Kurt Joonckheere's page about 

  (Periodic) variations in the rotation period of geostationary satellites

See also Jason Hatton's pages for more details on some satellites:

  Observing Tables for Bright Geoflashers
  Flash Period Evolution of Selected Bright Geoflashers
  [Non operational] Bright Geoflashers

See also Jonathan McDowell's Geostationary Orbit Catalog.

See also two of Mike Waterman's messages to SeeSat-L:
  Looking for Gorizonts and More on Gorizonts

See also Mike McCants': 
  Flashes from DSP satellites