I'd love to see a variation Sheevaplug come with powerline networking capability:http://www.homeplug.org/home
Right now the costs of the homeplug adapters is a little steep.
What about integrated WiFi?
Agreed, a SheevaPlug with the powerline-NIC capability would make it a killer app as all these 'network aware' home appliances become standard. You *could* add wireless, bluetooth, via a USB plug, but integrated in a future model would be handy...