The Benito board is a general purpose board for Atmel's at90usb162. Combined with open source code it can be used to easily create usb solutions. With relatively large components (tqfp, 806) the board is an excellent place to learn surface mount soldering as well as an inexpensive introduction to Atmel's 90usb family of micro controllers.
http://www.tempusdictum.com/tdproducts.html

http://dorkbotpdx.org/blog/feurig/build_your_own_usb_to_serial_device
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UDEV RULE for Bootloader Mode
As root (or sudo):
create file /etc/udev/rules.d/99-atmel.rules
with this as the contents:
--
SUBSYSTEM!="usb_device", ACTION!="add", GOTO="atmel_rules_end"
#AT90USB162 DFU
SYSFS{idVendor}=="03eb", SYSFS{idProduct}=="2ffa", GROUP="dialout", MODE="0660"
LABEL="atmel_rules_end"
--
run:
udevcontrol reload_rules
feel free to change the group to something that makes sense to you.