Iphone/touch applications for design

Couple of weeks ago I bought an Iphone on a whim. I’ve never been much of an Apple fan, but I have to say I’m quite amazed with this little piece of technology. Anyways just wanted to know what applications are popular with the design comunity.

I’ve installed the following
Clinometer - An amazing slope measuring tool
Units - unit converter (free application)
Ruler - basic ruler (free application)