Thanks for your relpy, Shawn. If you do find something that might work before an official release hits, please let me know.
As for me, I'm giving up - tonight I tried reinstalling Visual Studio 2008 (kept me up only till 3 A.M.) only to find that Intellisense still doesn't work. Thought it might have something to do with Beta 2 being intalled before the RTM. That obviously isn't it, because tried it on my workstation at work this morning - the same effect. I'm beginning to wonder am I really the only one with this problem (the same effect on two different machines - suspicious).
Well, I could do without Intellisense, but it does make things easier to learn (which is what I'm looking for). I still have VS2005 - I'm going to stick with that for Silverlight for the moment.