As to the thread topic, I would definitely wait awhile before installing Vista, unless you partion off your HD or have an extra computer to use. Microsoft has also extended support for Windows XP Home edition, so there is literally no rush here.
The question I have is, if I buy a new computer after Vista Home is released, can I still install XP on it instead of Vista Bloatware and if so how long do I have before I can no longer buy it?