Partition existing XP volume to add Vista?

[kirkbross]

I have XP running beautifully on a 150 GB Raptor (via bootcamp). I'm thinking of adding Vista, but I'd like to avoid formatting the drive and creating two partitions for XP and Vista.

Can I slice off some of the 150 GB for Vista leaving XP intact?

 

[blackoutspy]

I'm curious about this as well, is it possible to have both vista and xp working under boot camp regardless of drive layout or is there some specifics that need to be followed?