RedHat 6.0-6.1 were 2.2 kernels
RedHat 6.2 (kernel 2.2.14-6.1.1)
RedHat 7.0 was a 2.2 kernel also, but was a disaster - DO NOT USE - JUNK!
RedHat 7.1 (kernel 2.4.2-2)
RedHat 7.2 (kernel 2.4.7-10, and then later kernel 2.4.9-13)
RedHat 7.3 (kernel 2.4.8-3, and then also as kernel 2.4.18), 
RedHat 8.0 (kernel 2.4.18), 
Suse 7.1 (kernel 2.2.18), 
Suse 7.3 (kernel 2.4.10-4GB) 

Release Schedule
1.0 (Mother's Day), November 3, 1994, $49.95 
1.1 (Mother's Day+0.1), August 1, 1995, $39.95 
2.0, September 20, 1995 
2.1, November 23, 1995 
3.0.3 (Picasso), May 1, 1996 - first release supporting DEC Alpha 
4.0 (Colgate), October 8, 1996 - first release supporting Sparc 
4.1 (Vanderbilt), February 3, 1997 
4.2 (Biltmore), May 19, 1997 
5.0 (Hurricane), December 1, 1997 
5.1 (Manhattan), May 22, 1998 
5.2 (Apollo), November 2, 1998 
6.0 (Hedwig), April 26, 1999 
6.1 (Cartman), October 4, 1999 
6.2 (Zoot), April 3, 2000 
7.0 (Guinness), September 25, 2000 
7.1 (Seawolf), April 16, 2001 
7.2 (Enigma), October 22, 2001 
7.3 (Valhalla), May 6, 2002 
8.0 (Psyche), September 30, 2002 
9 (Shrike), March 31, 2003 (this release is labeled "9" not "9.0") 

-- MattWalsh - 25 Feb 2003