Skype is a sweet program that lets you talk to you friends over da internet through your microphones. This might seem like nothing new, but it's free, it works with the PC-whores, lets you conference call, and allows you to call any phone in the world for a local rate.(Calling computers is free) Any of you that get it and want to post your Skype names feel free to do so!
http://skype.com/products/skype/macosx/