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I was able to mount a USB thumb drive on my newly-setup laptop with BL3 
and using the 2.2.26 kernel and modules supplied by Steven. Here's a 
description of what I did after some initial, unsuccessful 
experimentation with USB.

After my initial attempts at mounting the drive did not succeed, it dawned 
on me that I might need to load modules in a certain order. Then again, I 
wasn't exactly sure which modules I needed to use. It turns out that I had 
initially used the right 5 modules for my system, but I am guessing that 
loading them in the wrong order was what prevented me from being able to 
mount and use the drive. I turned up some directions on the web using 
search terms usbcore+insmod+scsi+uhci that seemed to confirm that loading 
order of the modules is important. The directions that work for my setup 
follow.

First, I inserted the USB drive into the USB port. Then I insmod'ed 5 
modules in the following order: 1) usbcore; 2) usb-ohci; 3) scsi_mod; 4) 
sd_mod; and 5) usb-storage (my machine uses usb-ohci but others may need 
usb-uhci and/or uhci or even ehci: adjust step 2 to your own computer's 
needs). Once I loaded the modules in that order, a message appeared in the 
terminal telling me which dev file the usb drive had been assigned to. I 
then mounted that device file to a mount point I had created in the /mnt 
directory (mount /dev/sda1 /mnt/usb). I was then able to cd to that mount 
point and view the drive's contents.

The USB mass storage device in question is a 512 MB Lexar jump drive. If I 
have occasion to test other USB mass storage devices, I'll try and post 
the results.

James