I just updated the app in the Android Market. New additions include a menu, a page to search the example sentences and a page to look at JLPT vocabulary lists.
If you hit the menu button, you should see the new menu with four buttons.
Use the Search Usagi button to get to the regular search page. If you search by English, the search is now case insensitive.
The Search Sentences button will bring you to a page that lets you search the example searches. You should be able to search Japanese or (case insensitive) English.
The Kanji button will bring you to a page that will let you view a list of Kanji for each (old) JLPT level.
The About button doesn't do anything :)
That's about it for now. I've still got a few things I'd like to add. I hope you find it useful.