I too am overly satisfied with my Vista experience on my Mini. I have the upgraded ram and all. Mine came with XP and I ran it with XP for a while and man was it slow. Apps openned slower, it booted slower, it was just slower. I put Vista business on it, installed the new drivers and it was like night and day. I would never go back to XP now.
Dell Mini 9, Red, 2gb RAM, 64 GB HD, 3 separate HDs: XP Pro, Vista, and Windows 7
Dell Mini 10, XPS M1530, Inspiron 1308, Latitude X1, Latitude D420, Latitude D610, Latitude D620, Latitude D810, Latitude XT2