My USB pages have many links to development boards, articles, code
examples, etc.

I would look at:

FTDI for full-speed bulk transfers using their driver.

Mass storage class using the OS drivers except for Win98 gold.

HID class is probably too slow, except possibly at high speed
(requires USB 2.0).

For Ethernet + Java, see the TINI at www.dalsemi.com and
www.systronix.com.

Jan Axelson
http://www.Lvr.com