This is the first post on the site, so Welcome! to any of the 60, or so, people who have downloaded Usagi so far and are visiting this page.
I wrote the app to learn a little about Android and because one of my classmates only had an Android phone and couldn't use Kotoba! on the iPhone.
If anyone has used Kotoba! on the iPhone, you'll see that Usagi is based on (okay, maybe totally ripped-off) Kotoba! This is because I use Kotoba! almost every day and I think it's the best Japanese-English dictionary available.
I plan to make a few more improvements to Usagi to make it offer almost the same functionality as Kotoba! If any of you have any requests for features or enhancements, please send me an email. I don't plan to add the multi-radical lookup because I've never found it particularly useful.
Thanks and good luck with your Japanese.