Originally posted by HomerJSimpson
http://gamesarchive.iccf.com/ is the link to the International Correspondence Chess Federation Games Archive.
You can see some live ICCF games on the ICCF Webserver at www.iccf-webchess.com including the very interesting Umansky Timmerman gambit match.
There's some other good stuff on www.chessmail.com with info about all the CC world champions. One of them - Mikhail Umansky even has his own website with analysis of his Catalan Gambit lines both OTB and CC.
Edit: Many of the later games (post 1997) probably engine assisted.