Worth a look:

http://itunes.apple.com/us/app/trademark-manager-by-ipexl/id4203049...

I'd added the features:

1. Added 'famous brands' directory for browsing top 100 brands' newest trademarks.
2. Added feature to 'View/Edit Notes' for trademarks saved under 'My Trademark Collection.'

However, thanks to the feedback of a few TM lawyers, it is looking like version 2.0, that is currently under development, will have a whole load more features than this.