Shameless plugs
Recently I've been a "guest writer" on Jensen Harris' popular Office UI Blog (popular in the HCI and MVP communities, at least :P).
If you're curious about what I work on all day, check out my posts:
They're pretty targeted to 3rd-party ISVs that leverage Office 2007 as a platform, so if you aren't one of those then the articles probably won't make much sense (and will probably sound like complete gibberish if you aren't a programmer).
There probably won't be any new posts on that blog for a while (due to the holidays), but in a few weeks there should be more.
I also just finished up writing an article on RibbonX for MSDN Magazine, so if you're a subscriber make sure to check out the upcoming issues! Once it's published I'll grab a copy and get a pic up here.