Filemarks let you store high res images, text files, and PDFs on an iPhone! There aren't any good ways to do this with the built in Apple tools - you can use iPhoto to copy images, but they'll be scaled down and become unreadable.

If you want to read a pdf on your phone, you have to either email it to yourself or browse to it in Safari. Filemarks store your file's data inside a bookmark. When you want to view your file, you open the bookmark in Safari on the iPhone and you can view it, whether your phone is online or offline.

Filemarks let you store much higher quality images than the built in photo application. Check out the difference between iPhoto and Filemark images with this New York subway map!

Filemark Maker is a little program designed especially for Mac that converts files into data URLs which you can bookmark and then open on the iPhone. The best thing about a Filemark is that they work even when your iPhone is offline, so if you're in the subway or on an airplane, you can still view your files. It's really easy to use.