Lodsys and Android Marketplace in-game billing

We decided to give Google's (relatively) new in-app billing feature a try when we ported Pangea's Warheads from iOS to Android.  The goal was to give customers an opportunity to try out the game before they actually bought it. 

It was rather a tough decision because the API isn't exactly straightforward.  You need to do a bit of thinking in order to make it work for various scenarios.  We also had a number of bugs crop up after the game shipped.  After a few initial bumps, though, it seemed to work out pretty well for everyone.  

Until now.

Lodsys (the "patent troll company") recently sent citizen12 a fedex package detailing how they believe Warheads' use of Google's in-app purchase tech infringes on some of their patents.  We're not saying that we agree with them, but at this point our choices are pretty much:

1. Ignore them and hope it just goes away
2. Call our lawyers and try to fight it
3. Pay a royalty to Lodsys
4. Remove the feature

Not sure what we're going to do yet, but we want to get this out there as a cautionary tale to others who are considering using Google's in-app billing tech.  Don't think that being small is going to keep you out of the crosshairs of Lodsys and their ilk!