Ever stuck at someone’s house without the ability to manipulate a photo?  I won’ bore you with the details, but this has happened to me more than a few times.  Picnik looks to be an easy way to get a few basic photo manipulations done when you’re in a bind.  It also has a number of very cool features, such as integrating to Picasa and flickr.  Cool Tools, one of my favorite blogs, has a nice writeup.  Oh yeah, it’s free!