I've been playing around with a cool little app from Apple called 'Dashcode,' and I've made a small counter widget that will count down the days left until Microsoft will (supposedly) release their next-generation operating system, Vista [wikipedia.org]... however, I suspect I will need to update this widget with new times, as Microsoft has been known to delay their recent product releases time and again (Vista, which used to be code-named 'Longhorn,' was originally supposed to be released in 2004... then 2005... then 2006... now 2007...).
Download and install this widget (requires Mac OS 10.4 or later).