The high interoperability with Splashup and other media sites is a major highlight. Able to connect to Flickr, Facebook, Picasa, SmigMug, Photobucket and more you can pull your web images and save back. I stress "web images" because this software does not play well with high res images. It has basic editing features, does not take advantage of keyboard shortcuts and while working well, its filters are limited.
To get the effect I got with this Spashup example, I
used filters to make it Grayscale, then Enrich. At the size of the file, font would not show up, so I added the watermark in Photoshop.
Official site:
http://splashup.com/
Learning Splashup:
USCA.edu Student Page
YouTube Tutorials