|Get Urban (I think)|
I expect we'll be seeing some semi-automated comix coming out using some of these. The Heisenberg and Get Urban filters look especially useful in that regard, though the more painterly filters will no doubt also be useful.
There are a decent range of filter available for it, but your level of control over the effects is very limited — you can pretty much only control the degree to which the filter distorts the source photo, by the look of it.
I wouldn't mind being able to play with it on my Windows PC, but there's a certain amount of faffing about that has to be done to enable that, and I'm not sure I can be bothered.