One of a few Flickr front-ends for the iPhone, AirMe outdoes
Exposure (another free iPhone app for Flickr) by allowing you to
upload pics directly from your iPhone to your Flickr account.
Results are instantaneous: You snap a pic with your iPhone camera,
AirMe geotags it (if you want it to), and it's on your Flickr page
within a minute. On the other side of the fence, Exposure lets you
browse your Flickr photosets, see photos that have been taken close
to your current location (again, if you want it to), and basically
presents a iPhone-friendly front end to Flickr. It did crash a few
times during testing, however.
Note: This link takes you to the vendor's site. From
there, you can follow the link to the iTunes App Store, where you
can download the latest version of the software.