While Pocket Scumm is indeed a worthy to be on this list, I'd suggest you point people to the 0.8.2 version, rather than the current 0.9.0 version which is highly unstable. See, ScummVM has messed with its purple & green graphic interface, and replaced it with something that resembles its website.
At least for the moment, its practically unworkable on my Axim x50-mid. MI3 & FOTAQ have crashed, and I'm not about to test everything to see that it doesn't work.
Also, I don't know if this should be an addition to the list or not, not having tried it just yet. But I did find (via the forums) this apparently freeware DosBox port for the PocketPC.
http://n0p.averest-k.ru/?DOSBox_PPC
Kevin