Here are some links that I like.  I will add as needed. You can also let me know if you have any links you think would be helpful.

If you want to change your cross hairs -  www.bullseyecrosshairs.com

For some local Santa Cruz sounds -  www.kpig.com

For some of the latest in maps -   www.map-factory.org/halflife-2

The place to get the deathmatch -  www.steampowered.com

The place for free winzip -   www.filesforfree.com/winzip.htm