Believe it or not, my favorite part of the iPhone is actually "Visual Voicemail."

I just used it for the first time, and realized that it doesn't even have to dial anywhere before you can listen -- it just stores the voicemail on your phone. AND it user a time slider to let you know how long the voicemail is going to last, which is fantastic, particularly when it's my mom who's left a message, because now I can *tell* that she's going to go on for 4 minutes and plan accordingly.

Impressive!