Here are links to Halflife related sites.

Bots
HPB Bot A very nice bot, and improving slowly.
Fox Bot A good bot, comes in right behind the ODD Bot.
A_Bot A dead bot(no more updates), but has some good features.
ODD Bot This is the best bot around for TFC, sg's, sniping, chat, combat, the list goes on and never stops! :)

Halflife related sites
Pet's Workshop Map review site for the semi-experienced.
Department of Engineering map testing, and tutorials.
Waypoint Warehouse Probably the best, and most bot waypointed site out there.
JMC Map Archive One of the best map archives I have found.
Planet Halflife Halflife news site.
Counter Strike The best mod made atm, other than TFC.
HL Editing Tuts half-life editing tutorials.
LOA Legends of Apocalypse. The clan I am in.
Counter-Map CS mapping help.