Trellian said:I would rule that you could only move 5 ft, but you're right, it's a little weird. My wizard usually moves towards the target, casts the spell and touches him. I think maybe it's included as part of the spell-casting.
That would make sense if it were not that the move can come in between the casting and the touch!
Furthermore, touch attacks don't provoke attacks of opportunity!
A rules burp indeed, it seems intended to make the Cleric even more god-awful overpowered, given that he'll be the main touch-attacker.
It seems that the principles of the rules are being bent just to give the cleric unavoidable touch attacks, which of course include Harm.
I think I'm going to have to Rule 0 this, it's truly appalling.

Rule 0'd, Just applying the general principles of the rules:
You can move and then spellcast, with a touch as part of the spell, but this provokes an AoO.
Or you can cast the spell 1 round, then try to touch next round. That brings things back more to previous editions where Harm took a minute to cast, so you had to pre-prep it.