It must be stylus month on Kickstarter, with first the Cosmonaut and now the Flow appearing on the funding website. Like the Nomad Brush, the Flow by Joystickers is modeled after a paintbrush. The Flow has capacitive bristles rather than the traditional foam tip to more closely match the tactile experience of painting with real paint.
One of the things that's always frustrated me when painting on the iPad is that the friction from both my finger and any of the styluses I've tried isn't quite right. It can work very well for sketching, but when I open up ArtRage and start using a paint tool, there always seems to be a bit of a tactile disconnect from what I'm doing. A paintbrush that works with the touchscreen seems like the best possible solution short of pulling out real paint and using your iPad as a canvas -- which we definitely do not recommend.