OT: Lowest-power small server solutions

Chuck> This may be appropriate for another list, but it seems to me Chuck> that there's plenty of applicable knowledge here. Chuck> Right now, we're using an older Compaq Deskpro P3-600 box as Chuck> our incoming Linux server. Basically, it connects with the Chuck> DSL modem and contains IP masquerading, DNS caching, firewall Chuck> and fetchmail/procmail/qmail tasks (SpamAssassin included). Chuck> It runs 24x7 with no problem, as it has for the last 5 or 6 Chuck> years. Built like a tank. Chuck> I'm wondering if something a little less power-hungry might be Chuck> preferable, however. Are there any low-power alternatives for Chuck> the job that anyone can recommend? How about an old laptop? UPS built-in... :-) paul