Release notes notwithstanding, YA 3.x (incl the Lite/free ed.) seems to work fine with XP Pro SP2. I don't even know anyone in a corporate setting with Vista. A few propeller heads playing with it at home on non-critical machines maybe.
I like to think we're normally cutting edge on some things but we've been told it will be at least a year before the first Vista rollouts and only then to a 'control group' of between 50~100 users. Tho we're one of the Fortune 500, our IT team in Desktop Systems has told Sr. Mgmt folks that
presently there's no business reason for anyone to move to Vista. XP is not going away anytime soon. In case folks hadn't noticed, MS is still sending out security update patches for Win_2K, more than a year past when they said support was ending.