tiny firewall boxes

[teddy mills]

I find myself having to install Linux firewall boxes in front on Window 
servers.
(dont ask dont tell) I do not want big +bulky for the Linux firewalls. 
Smaller is better.

I could use DLinks or Cisco/Linksys, but I know a Linux firewall would 
be better. (perhaps for cheaper in this case)

Any ideas/urls for tiny form factors?
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