As you know the NSLU2 can run linux.

pros
it can run linux
it has 2 Host USB ports(expandable to 5),
internal serial port
10/100 ethernet
internal Function USB port
runs on low voltage DC
has 133MHz ARM processor (simple hack to upgrade to 266MHz)
can give any empeg USB host support+extra serial port, and ethernet to the MK1.

cons
costs $75 and up
needs to be hardware hacked to auto power up and down.
storage costs extra.
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I was N2TOH, but forgot my password and need help resetting it. I get no reply from emails sent to the admin. 20GB MK2 Green 080000171