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I recently (as in, this morning) upgraded to a newer cable modem, per suggestion from Comcast, and have this slightly used Linksys for anyone that wants it.
It is a Linksys Broadband Etherfast Cable Modem, model BEFCMU10 version 4, with DOCSIS 1.1 and 2.0 capability. See here: http://support.linksys.com/en-us/support/routers/BEFCMU10
I'm cross-posting this to the Wiki Virtual Graveyard and the i3 list, to catch anyone that doesn't read the forums.