Imho, this is a very pragmatic and customer-focused move on Adobe's part
We had all the noise last week about IBM supporting Open XML in a number of their products. Today I learned that Adobe's Buzzword, a web based wordprocessor, now supports reading and writing .docx files. Very cool: http://forum.buzzword.com/viewtopic.php?f=2&p=980
I think they also have plans on supporting ODF, but it's not clear when that will be available.