Hm, on rather dim news: I've read that the Virtual XP-System for Win 7 (so far) only emulates an S3 Trio graphics card, which is a joke and won't allow for glorious gaming :/ Let's hope that this changes until release.
Also, as things are now, you wouldn't be able to run the Virtual Machine, as you 'only' own a 7-series Core2Duo, from which Intel has cut some features, one of which would generally benefit virtualization, but Microsoft has (so far) stated, that this feature is needed for its Virtual Machine. Which is rubbish, if you ask me, as their own Virtual PC VM-application. upon which the XP mode is based, doesn't need this as a prerequisite.