right now I use PicUP, which will upload pics to flickr, facebook, etc. It works fine but resizes the pics kinda small, I'd like to find one that uploads the full image (or at least bigger than PicUP does).
I use the flickr mobile web app. I tried a couple of apps, but they don't do what I need them to. The web app is rather nice. I just navigated to my "sets" and set that page as the bookmark, then added the bookmark shortcut to my desktop.