I agree it's hard to do really detailed research similar to, say, the Google Keyword Tool. It's mostly a gut check. "Does this have a lot of competition? Does this keyword appear to get a lot of searches?"
Nice landing page for sure. Maybe this is obvious, but they key is finding out a solid upgrade that makes IAP's worth it to customers.
Agreed. Doing a freemium model where you can save only save 1 poem. Unlocking adds theming, Facebook+Twitter connection, and unlimited poems. Worth $.99? That's subjective, but this entire app is more of an experiment than a business. Just going to iterate and improve on the next one.