this looks like a interesting shareware prog. www.pixarra.com
Not a bad little program, but… I’m not sure if I’d take it over Dogwaffle 
i think dogwaffle is better,i tested both demos now.
I’m quite interested in version 2… even though it doesn’t have a demo yet. It’ll give Painter a run for its money, that’s for sure.
painter is cool,im thinking about buying it since the last 3 month,but im still not sure cause i have photoshop7 and zbrush.im thinking that is enough for the moment.
another interesting tool: http://jijigaga.com/product/
pixia is a great tool,ihave it too.