Draw on it
Nice little drawing app offering plenty of flexibility and options.
There are a lot of these kinds of social discovery apps out there today which tap into your Facebook profile and help you find people you might be interested in nearby.
With its maps, schedules, and lots of other info, this is an essential app to have on hand if you're visiting South by Southwest this year.
I'm still not sure I understand how this saves battery life. I know it turns off certain background functions but still trying to figure it out...