Available now on the iPhone App Store: Charlie
[Charlie works with iPhone 3G, the original iPhone, and
Flickr Finder is a Mac-only application that lets you browse Flickr photos without a browser.
The interface is similar to the Mac Finder.
I just fixed the bug that caused the application to crash in OS-X Leopard - please download the latest version if you have the crashing version.
Oh, and it's free.