I often use sites to find out what certain fonts are, but now I'm gonna use the magic iPhone.
From the site: "Ever seen a great font in a magazine ad, poster, or on the web and wondered what font it is? Whip out your iPhone and snap a photo, and WhatTheFont for iPhone will identify that font in seconds!
WhatTheFont for iPhone connects directly to MyFonts’ acclaimed font identification service, which has been helping customers pinpoint mystery fonts for 10 years. It works via Wi-Fi or the mobile phone network, so you can get your font fix right there on the spot"