It'd be nice to have a little notice when a new AOM version is released.
If AOM is the 'official' AniDB client, you could have something in the data dump which indicates the current AOM version, and have the client check against that at each refresh.
And while I'm at it, it'd be nice to have Help > About, with a link to where to download the client from! And maybe a little info about the author, I always check the 'about' boxes on software I like.
Sorry to hassle you so much today!