Using iPhoto to Upload Pictures to gallery
Grab a copy of iPhotoToGallery: http://zwily.com/iphoto/
Install it, and then open up iPhoto (or just quit and open it up again).
In iPhoto, select the photos you wish to upload, and click File -> Export.
If this is the first time, you can add a gallery, easily like so:

Once you’re done, click the Gallery tab and put it in the appropriate gallery.

Click Export, and you’re off!
Check out the FAQ, if you’re having problems.
http://zwily.com/iphoto/wiki/index.php?n=Support.FrequentlyAskedQuestions
