The other day I was tweaking my photos with Picnik and was able to turn two okay photos into ones that, I think, are now pretty great.
For this photo I used only the Boost feature. It makes the colors really pop.
Lulu's photo uses both the Boost feature and the Vignette features. I like how it creates the soft framing.
There are also premium features available that seem to rival photoshop. I have photoshop on my computer but I have no idea how to use it. If I took more photos Picnik might be something I'd pay for but at this time the free portion works for me. I use the red eye feature often.