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ost_uid0]Okay, two days after the "we'll announce tomorrow," here's the cameos. Or at least, the ones I know.
Part 1: "Purnell" is the real last name of FatMatDuhRat and "Aki" is his dog "Kia". The NYC locale should also have tipped off anyone who has been around the boards at the same time as FMDR.
Part 2: As previously established, "Akili" is Nan's real name. (And no, it's [i

ost_uid0]not[/i

ost_uid0] Alkali.) The clue there was that she was described as "mysterious," as in "Nan the Mysterious Romulan."
Part 3: The "Baron" is Celeste, because that's her last name. The clue there was the Baron's dog, "Bernie," since Celeste owns a Bernese Mountain dog. (As anyone who's been around the forums for a while well knows.)
Part 4: "Windham" is saxamaphone; his real name can be seen on any of his fivers.
Part 5: "Colonel Saxon" is MmeBlueberry, a.k.a. Amanda Saxon, a.k.a. Amanda Dean. The hints there were many: the strawberry patch (not blueberries, since this is the mirror universe), Derek's comments about the Colonel being a woman he'd like to meet, and the comments about Colonel Saxon and marriage.
Part 6: "Greg 'Soon' Thaid" is an anagram of "Things Are Good." That one was probably the hardest unless you suspected it was an anagram.
Part 7: Ask Zeke. I have my own guesses but I don't know for sure.
As for the next part -- does anyone want to take a shot at naming all the worlds sleaped too?[/color

ost_uid0]