I uninstalled Dell Dock with no ill effects. It seemed to speed things up when I did so. I normally only have 4-5 icons on my desktop anyway, so the dock didn't do much for me.
My Mini 12 is running Vista too (just until I have time to sit down and do a full Win 7 or XP install).
Mini 9 (910): Cherry Red, N270, 2 GB RAM, 16 GB STEC SSD, XP Home
Mini 10v (1011): Passion Purple, N270, 1 GB RAM, 160 GB HDD, XP Home
Inspiron 11z (1110): Passion Purple, SU4100, 2 GB RAM, 250 GB HDD, Win7
Alienware M11x R1: Cosmic Black, SU7300, 4 GB RAM, 160 GB HDD, Win7
Latitude 2110: Blue Ribbon, N470, 2 GB RAM, 250 GB HDD, Touchscreen, Win7
Zino HD (400): True Blue, Athlon X2 3250e, 4 GB RAM, 500 GB HDD, Win7
Plus a few others not discussed here...