If you have been under a rock for a while, you might not know that VMWorld 2008 is happening in Vegas this year. (This will be a 2.0 event so I assume a lot of the kinks from last time will have been ironed out!)
Today, a colleague of mine (Thanks Aaron Silber!) sent out great little link for Microsoft's new FareCast website. Using historical data, Farecast will predict if you should buy your tickets now or wait for a lower price based on trends. I don't know how accurate it is but it is a pretty neat idea in my book.
You can also graph fares to make your own judgment calls. There are also some quick links to draw further comparisons from some of the other discount travel brokers out there (Priceline, Travelocity, etc).
See you in Vegas!