99er - The host of this website with many great sections.

Jon Guidry's website - Lots of TI and 9640 information here

Mainbyte's TI-99/4A Website - Ron Reuter's sit with lots of tech information.

Richard Bell's Site - TI-99, 9640, CC-40 site.

TI Forever - A French website with one of the only TI-99/5s in existence.

TI Online Users Group - The official Online Users Group.

Yahoo Groups - TI-99 - A Yahoo group with much activity.