I was just considering to test IBM's Lotus Symphony suite, and here I found a notice to the effect that in the future, IBM will support OpenOffice.
http://en.wikipedia.org/wiki/IBM_Lotus_Symphony
- Well, that's not bad for us, actually. It means that we now really just have to target OpenOffice compatibility (though, of course, MS-Office compatibility would be very desirable, too).
And, of course, it means we have one thing LESS to test.