I was looking for a similar interface to iGoogle, with movable widgets, but
using free software. The nearest I've found is a Mozilla based project called
Spicebird.
Although it is an application. It looks better than iGoogle and it has
similar "drag and drop" widgets. Its released under a free software license
as well. Now all we need are more free software widgets.
Web site
http://www.spicebird.com/
Screenshots
http://www.spicebird.com/category/image-galleries/spicebird-screenshots/spicebird-08-screenshots