I've written a guide (with a bash script) to compile ImageMagick, with support to PNG and JPG as a static library to be used when programming something with the iPhone.
I've tested the result and it's fully working and easily integrated within XCode and Objective-C.
You can find the instructions with links to the script here:
http://www.cloudgoessocial.net/2009/06/ ... -jpeg-png/
Also please read the update to guarantee the full usability of ImageMagick on the device when coding against it:
http://www.cloudgoessocial.net/2009/06/ ... ne-update/
Please let me know if you have any comment, or if you want to compile the static libraries but don't manage following the guide.