Whatever you do, don't do ads, Try to fit in a subscription model (not sure how the play store works with subscriptions), but I see it useful enough to pay a small subscription fee.
I feel like this would be a good listing for latonas.com, Rick Latona has built a huge following of clients willing to spend in this range, http://latonas.com/
I too learnt django by doing, at first, i did everything my way ingnoring the plugins, then eventually when i understood the concept of what needed doing, then i'd find a package that does it better so to speak. Django 1.3 isn't that different from older versions (class based views are the biggest thing) ... i always liked living on the edge using the svn dev version.
I don't think anyone has mentioned this here, but buy Generic domain names for resell or development, can give you quite good returns... look at http://www.dnjournal.com/domainsales.htm for information on recent sales/prices.
Hit me up if you have any questions about domains.
Hey, very nice app... here's a request/recommendation ... I'm the expecting daddy, i created the page but would now like to give my wife access to add/delete stuff... is there something to invite the mommy/daddy to use the same account? I know the mom's are supposed to create this, but i couldn't help myself... really nice site.
http://www.TutorialShop.com - bought many years ago, can't seem to come up with a good enough Tutorial model for this site. Willing to partner or trade.