sp1.info usual site type. XPsp1 is history but 2003 is current and vista will soon be here. value? will be developed as I think it will generate traffic and .info tld is right.
Yeah, domain iteslf has little or no value at present, but if developed as you say it will grow in value quickly as the name is relevant to the content you are going to put on there. Make a good mini-site and it could be worth $xxx, peaking when vista sp1 emerges (get your site ready for this now!)
.info are worth so little now, I think $70 is a generous estimation, even for a 3 letters domain. sp1.com and sp1.net don't seem particularly popular either... but yeah, do develop it.