Migration Assistant time out?

I have not been able to migrate from a Powerbook to my MBA. I have read the various threads here and used their suggestions to no avail. Here's what I've done to prepare: loaded the new Migration Assistant program that came on the CD onto the Powerbook, turned off the firewall on both machines, enabled file sharing, purchased the USB ethernet adapter, plugged both machines into a router.
Here's what happens:
I run Migration Assistant on both machines, using the proper "to" and "from" settings.
The Powerbook says it sees the MBA.
I enter the passcode on the Powerbook that the MBA produces.
The MBA Migration Assistant says it is "preparing information."
For some reason, the Powerbook Migration Assistant now says "searching for other computers." (There are no other machines on the network.)
This goes on for about 5 minutes, then the MBA says "network connection failed."
I know that the machines are connected and seeing each other (I can mount each other in the Finder), but for some reason Migration Assistant can't proceed, and I suspect a time out is really causing the "connection failed" notice.
I also tried this wirelessly, with the same results. Any suggestions? Thanks.

Well, it looks like I can answer my own question. There seems to be a particular problem in migrating from a MacBook G4 running Tiger to an MBA (on Leopard, of course). I went to the Genius Bar at the 5th Avenue store here in NYC. The Genius went though the regular migration procedure, and ended up with the same situation as reported above. He tried several different things, including trying to pass the migration through a portable hard drive. (MBA-ethernet cable-hard drive-ethernet cable-MacBook). He talked to other Geniuses. All to no avail. He put the problem into the official Genius database that goes to Apple engineers. He suggested that I upgrade the MacBook to Leopard and see if that made a difference. He acknowledged that Apple says it can migrate from Tiger, but he thought it might work. As it happened, I had an unopened copy of Leopard at home, because I hadn't had the time to upgrade. So I upgraded, then did the 10.5.2 combo update on both machines. I crossed my fingers, plugged in the ethernet cables, and presto, the migration started happening.
Some tips on migrating: before starting, use Energy Saver to set both machines to sleep never. Just for good measure, set the Display to sleep never, and I suggest even setting a Disable Screen Saver corner in Desktop & Screen Saver and move your cursor there after the migration starts. (Not doing this meant my first migration attempt was calculated to take 19 hours, and I would have to babysit the trackpad all that time to avoid either machine sleeping. After force quitting Migration Assistant and resetting those controls, it zipped through in less than 3 hours.)
I hope this can help the other people having the same problem. Bummer if you have to buy Leopard, though...

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    Choice 3 - Will try and find my own (also in a box somewhere) or ask other contacts with simular configuration and borrow their disks (which sort of voids choice 4)
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