Excite Network Games Site
A reliable source for downloading demos and shareware games.  You can buy what you try.

Gamecenter.com
If it's not listed here it's probably not worth playing.  Game coverage on this site is from A to Z and a few you've never heard about.  Check it out.

Gamespot.com
  A cornucopia for gamers.  This site usually has the latest releases of shareware in their software library.  Gamespot also has an extensive listing of walkthroughs and strategy guides.

Happypuppy.com 
One of my favorites.  Since it's inception Happypuppy has been a cutting edge gateway for gamers worldwide. A vast database of demos and shareware plus online purchasing.
Try out Lord's Soths index.

Hotgames.com
Just what the name states.  The hottest new releases and online game links for your pleasure.

The SoftwareZone
Looking for that special game for Christmas?
Check out this site for hassle free online game shopping.
Try before you buy.