Splashup is a pretty obvious adaptation of the popular open source program, GIMP, as a WebWare application. I'm am very impressed by how well it has been done too.
Let me add here that GIMP offers much more capability than Splashup does, Scriptfu addons and filters that make it an open source competitor of the commercial Photoshop program. (Though not fully, if you have the cash, Photoshop and Fireworks are still worth the cash.)
Still, this webware has some features that make it a great addition to your image editing abilities from any computer web browser with flash.
To begin with it will load files from your local hard disk or a number of online repositories, Flickr, Picasa and Facebook. In addition if you are needing to edit over several sessions of use you can save it to a splashup format which keeps all the layers, etc. that you have used during editing.
In short, give it a go. I think you'll be pleased.
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