Our IRC home is #texasxtremerpg on freenode.org. Come drop by to find a game or to just chat about RPGs. Come introduce yourself and maybe join or start a game!
We have a free Wiki that you can use for worldbulding and game tracking. It's based on the powerful and clean DokuWiki software.
Our web forum is based on phpBB and has a neat diceroller function built in for your convenience. Check it out; it's a great way to play in between live games.
Our SRD is cross-referenced and indexed better than any other SRD we've seen so far. It also isn't cluttered with third party OGL materials on purpose.
Many of us hang out in the IRC channel #texasxtremerpg on freenode.net. IRC stands for (I)nternet (R)elay (C)hat. It's an old-school way to chat online and is completely free. Another great channel for RPG fans is #D&D on freenode.net as well.
You can either connect with an IRC client of your choice; or, you can use this handy webchat link if you are new to IRC and just want to take it for a test drive. Hexchat is a good client for someone new to IRC and is available for Linux, OSX, and Windows.