I haven’t been using my Eye-Fi card because I prefer using a higher capacity 8G card with the D40x & D90’s large file sizes. I also prefer to choose which pictures to upload and do any necessary touchups rather than just upload everything immediately.
When I heard about the D90’s Eye-Fi support I decided to give it a try. The D90 recognizes an Eye-Fi card and adds a new item to the setup menu which lets you choose whether you want it to upload automatically. The D90 also adjusts its power settings to avoid shutting off while pictures are uploading.
When I do upload from the Eye-Fi card, rather than uploading to Flickr, where I prefer to be a bit more selective, I always used Picassa as sort of a dumping ground. I also have it upload to a folder on my MacBook Pro, where I can import it into Aperture, do any necessary touchup, and upload the best to Flickr.