Chess Tactics

Where is the best site to study and actually work out tactics?
Ive heard that tactics are 99% of the game.

Thanks man.. do you have any others?

Awesome man Thanks!

I'm not sure about the best site, but the best software is definitley Chess Tactics for beginners by convekta.

www.Improveyourchess.com has some great tactics all taken from real games. I can only manage the beginner section at the moment and you don't get to look over the answers untill you've completed a section. Also they are often tactics to acheive a subtle advantage making them realistic but not so obvious. Downside is you have to subscribe to the site and I'm not sure what's available without subscription.