I'm not sure if
copy & paste has come up yet, and I haven't tried this, but here's a link to a podcast called iCali. She goes through stuff about the iPhone and is cute.
iCali
...did you know that you can click the micropone portion of the headphones to end a call?
I've watched a few of the podcasts and have learned a bit each time.
Edit: Oh yeah, I can't tell if the vid plays properly, as I haven't got YouTube or, apparently, Quick time working yet... Sorry.