"ImgOps is a meta-tool that lets you quickly apply many online image utilities to an image. " enter the url of an image and you can edit, add effects, convert format and other stuff. You can also add their bookmarklet or just insert http://imgops.com/ in front of an image's url
Kathy Schrock provides infographic images containing lots of apps - updated May 2012 - "Each of the images has clickable hotspots and includes suggestions for iPad, Google, Android, and Web 2.0 applications to support each of the levels of Bloom's Revised Taxonomy."
"Social network for people who love books. Create a virtual bookshelf..." has widget that can bee added to your blog. Click on book image on the "shelf" to get to an editable wiki where you can review, comment or join a booktalk about the book.
Free converter will convert lots of kinds of files - image, audio, video, ebook, etc. - into other kinds of files. Looks great but haven't tried it yet. Reply to this if you've used it!