Problems with USB under 10.6.7

I have a Macbook Pro 1,1. After the upgrade to OS X 10.6.7, I started seeing frequent, unpredictable disconnects, with the resulting admonition to alway eject my removable drives. At first I thought these were due to problems with cables or my hub, but it happened equally often with flash drives plugged directly into the ports. I downgraded to 10.6.6 several weeks ago and have not had a single problem with disconnects.
I prefer to have my system upgraded to the most recent version. Is there any solution to this, or is a fix coming up?

It is interesting (though I haven't read all of it yet, I will continue reading), but it doesn't completely answer my question...which in itself is less complete than I intended.
Though the drive disconnects under 10.6.7 are a problem, they aren't the only symptom. I also have problems with my Alphasmart Neo, a simple, self-contained word processor. It connects via USB to allow plain-text documents to transfer to and from a computer, and under 10.6.7 I simply cannot reliably transfer data to it. Its management software doesn't reliably connect, resulting in corrupted data or a complete inability to send or receive information. The device works perfectly under 10.6.6.

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