I read hacker news for a long time and decided to join just to congratulate you for this!
I'm a developer and truly like the database aspect of the app. Linking tables is super easy and I like to organize some things in a certain way. Google Docs is not enough most of the time.
Right now only need it for personal use and totally loving it! One thing I haven't figured out yet is how to do auto increment in keys.
I'm also looking forward for the android version.
I also have a suggestion but not sure if the direction you're going for. I'd love to be able to do stats. Being able to query the data in a certain way (besides filters), building the select statement.