Noticing the same behavior:

o...@coffee-bean:~$ uname -a
Linux coffee-bean 2.6.31-15-generic #50-Ubuntu SMP Tue Nov 10 14:53:52 UTC 2009 
x86_64 GNU/Linux
o...@coffee-bean:~$ lsusb
Bus 002 Device 005: ID 13fe:1f00 Kingston Technology Company Inc. DataTraveler 
2.0 4GB Flash Drive
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 007 Device 003: ID 0b97:7772 O2 Micro, Inc. OZ776 CCID Smartcard Reader
Bus 007 Device 002: ID 0b97:7761 O2 Micro, Inc. Oz776 1.1 Hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 002: ID 0461:4d15 Primax Electronics, Ltd Dell Optical Mouse
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub


It's important to try huge files.  I am copying a VM that's about 13 gigs and 
notice consistently that when i copy i start out with a high transfer rate -- 
around 20MB/s and by the end it's dropped to 3MB/s.

-- 
USB transfer is very slow on Ubuntu 9.10
https://bugs.launchpad.net/bugs/477843
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