I've decided everytime I find a game being beta tested. I'm going to post links here. So have fun with these first few titles.

Metal Gear Online (PS3 Only):
http://www.onlineregister.com/konami/mgops/

Freaky Creatures (PC):
http://www.myfreakycreatures.com/

Great idea thanks for the links

No problem! I figured the more we're involved in the process of game development the better. I'll post more as I come across them.

Here's another open Beta for your list: http://beta.ageofconan.com/beta_application/

Here's a few more betas for ya

Requiem: Bloodymare (PC)
http://www.playrequiem.com/

Bomberman Online (PC)
http://www.bmoworld.com/

I've been playing bomberman for about an hour its pretty fun. Its a bit buggy though.

Here's a free FPS for you. I know it's not a beta but hey. They'll be doing a closed beta soon.

Comvbat Arms
http://combatarms.nexon.net/

Football Superstars(PC) Sports MMO And by football I mean soccer. They'll be moving on to a limited closed beta soon.
http://footballsuperstars.com/

Richman Online (PC) Made by Aeria this is a pimped out MMO version of monopoly. Buy property, trade stocks,and a few other features. Now I haven't played this yet, I did watch a trailer for the game which told me nothing about the game. I love when companies do that. I'm going to get it and check it out anyway.If anyone else decides to let me know I'm always up for playing anything
http://richman.aeriagames.com/

On a side note, Aeria has many other free MMO games. I'm signed up for their newsletter and I'm invited to betas of many of their games. Most are pretty good especially if your low on cash.

Warhammer Online has gone into open beta testing from file planet of course there's a catch. You must sign up for their premeum membership which is $5.95 a month. Not too bad really, there are other packages you can sign up for that have some cool stuff.
http://www.fileplanet.com/promotions/warhammeronline/index.aspx

Lord of The Rings Online has a new beta out too.
http://www.unlocktheminesofmoria.com/

There are three minigames but I can figure out where the hell he beta app is. Let me know if you figure it out.