Good point regarding the legality of the 'ports'.
I found the following at the unofficial Apple weblog (TUAW)-
"Sarien, a.k.a. Martin Kool, hasn't received a cease-and-desist from Activision yet, but he has received some kudos from some of the original games' creators. Hopefully that will be enough to keep Activision's legal team at bay, at least until they get these games on the iPad officially.
Don't let that stop you from enjoying these games while they're up and available to play -- I just gave King's Quest another shot, and it's weird to go back and play a game where actual death is around every corner".
I was under the impression that Sarien.net was affiliated with Sierra or the game devs. To be on the safe side, I've removed my links on my ipad.