I downloaded alice.org recently and it's really good. I managed to import a few projects that I already had in 3ds max. It allows you to download a few other 3d models that are made in google sketch up and other software as well. There seems to be loads out there.
Scratch is good but I think alice.org is great. You can manipulate the images in 4 screens similar to 3d manipulating software. Really good... working on the tutorials at the minute but looks great so far. Scratch was limited in functionality for what I needed it for and at the minute alice seems to import a lot of the images that I want as well... we'll see!http://www.alice.org/index.phpHere's where to get more images too....http://www.tech4dreams.com/AliceWorlds/f31.php
Found this as well which is pretty cool... dynamic drive.http://www.dynamicdrive.com/
Dr. Patrick Felicia's workshop at CESI this year was great and gamemaker is a great tool. I had a look at scratch too and for some reason I am drawn to alice.org. It was sponsored by EA so it looks like the graphics are really good and the fact that I can import some of the 3ds max files that I have is brilliant...