So I've been messing around with extra operating systems on my Toshiba satilite A105 series laptop. Particularly Vista. there has been talk on a public Beta 2 Release later this month. Can somebody tell me how to "get in line?"

Also a little side question. I'm interested in dual-booting some earlier systems. I've got some of the older windows, but I'm unsure about the complications with installing and then removing the older operating system once I was done messing around. Is there any complications I should worry about?