just a heads up to people upgrading to WP 2.x Something is wrong with the combo of iPhoto, WP and Photon. Photon is not being actively updated (and hasn't been updated since iPhoto5 and WP 1.5), so I assume this is where the hiccups are coming from. If you can actually get the Photon UI to work correctly, it will still give you server error messages, even though it uploads to the server and creates the post entry. It will not upload more then one photo at a time. This is a big hiccup in the "iPhoto > Photon > WP" workflow.
I'm issuing a call to anyone in the blogosphere with experience developing mini-apps for OS X and WP experience, to step up to the plate, to get Photon back on track. I'm pretty sure the changes are minor. I'd be glad to assist in any way possible, that a graphic/web tinkerer can. Even forking up some micro-payment-ness.