Seeing Friends online

[PGL]

besides looking on Bungie.net this one works wayyy better

http://live.xbox.com/en-US/profile/Friends.aspx

[DoubleKill]

Yeah it's way better for sending messages too, text ones are easier than voice

[GlxyDs]

I always go on there to check who is on and to send messages while I'm offline. For those who have never used it, it is definitely useful.