It's awesome that Cythera works, I'll have to try it myself before too long. I'm also very glad that my instructions that I wrote up have been so helpful for everyone (both here and in the Ferazel thread).
Having read the thread, here are a couple of things to note. SheepShaver does not care what the extension on the extra hard drive for file transfer is, so you can indeed just call it share.iso or whatever, as someone else pointed out. However, be very very careful not to EVER have it mounted in OS X when SheepShaver is running; you're guaranteed to corrupt it, and you could kernel panic OS X as well. (As a matter of fact, the os9hd image is also an ISO, which you can rename and mount. Probably not a good idea, since OS X tends to screw up the 'magic' of certain disk images which OS 9 probably requires. I've never actually tried it.)
And regarding JIT... if you're on Intel, definitely turn it on, it will help a lot. On PPC, you do NOT want to use this, it won't work, and you're directly running instructions on the CPU so it's pointless anyways. (I'm not sure if you are even allowed to turn it on, I haven't used SheepShaver in a while).
Oh, one more note... there are newer builds available from the emaculation forums, right now the most current build is available at http://emaculation.c...opic.php?t=5004 (not sure what has changed since the May build).