Where's my PC Dos 2.10 BASICA.EXE?

Hover-over user interfaces: NO. They are just wrong and awful.

Yes, I say UI, because UX is lame. I'd say GUI, but at this point I'm OK with letting go of the G.

Don't try to be clever, just make your thing a good servant to the user.

Is your UI about manipulation, putting the user second? Blech.

If you ever have the "too bad for the user, they can always do this" thought, then your UI, 'scuse me, UX would probably frustrate the living $hit out of me.