On my rezzy I have Apex and Vire. Vire is quite unique but sadly does not rotate. It's good for something you can keep vertical.
My old tbolt had Go. Worked out well because some of the widgets like the calendar were exactly what I wanted.
My TF300 on stock most of the time but I've been playing around with that tablet version of Go.
My co-worker swears by Atom as one of the lightest, fastest launchers around and he puts that on everything he owns.
My most common one is likely Apex. I've used Nova and Chamelon on a few too. Chamelon is cool because of the uniqueness. When I post screenies of it, I tend to get a few OOO what's that? If you have devices capable of handling them, Next, TSF Shell and SPB are a lot of fun but they tend to get expensive for a launcher. SPB is a real sloth on older devices. TSF Shell's themes and little animated objects are a blast.