http://www.gamefaqs.com/console/segacd/
was already mentioned. However, a lot of import and rare games are missing any info.
http://www.segacduniverse.cjb.net/
Has good reviews of all the US games (no imports). Unfortunately, the webhost is a POS. It gives about 5ppm (pop-ups per minute), and often the front-page won't load right the first time, you have to hit refresh once to make the front-page load (weird).
http://www.videogamecritic.net/
Has a few too, though I don't agree with most of his reviews.
For a complete list of all known sega CD games (including imports, demos, and unreleased) goto
http://www.atani-software.net/segabase/Seg...egaCDGames.html
However, I disagree with nearly all of the reviews on that site... they give poor reviews to most of my favorite games.
I usually try to see what other games reviewers compare to, because if they say it sucks because it's like game X which I like, then I might like it even if they don't...
And sometimes I find just looking at the back of the box a good way to see what the game might be like.
http://www.vgmuseum.com/scans/segacd.html
http://www.vgmuseum.com/scans/megacd.html
http://www.workingdesigns.com/museum/sega_cd/software/
Once my new webpage is made I hope to put up my own reviews of games I've played, just so that there can finally be a positive review for all the games I like that just get dissed everywhere (Like Microcosm CD and Motocross 32x).