If you like LiveATC, you might also like
www.dxtuners.com .
The really cool part about DX is that you can actually change the freqs you're listening to. Generally, you have to ask the other people listening to that radio if they mind if you change it, but people have been pretty cool about it. I was sitting in a hotel near LAX, watching planes come in from my room. LiveATC's feed to LAX was down, so I pulled up DX tuners and listened to various freqs...it was really cool to SEE the plane I was listening to.