http://store.sun.com/catalog/doc/BrowsePage.jhtml?catid=100054
Not bad for Sun, this box is actually somewhat price competitive. They're finally waking up and dropping their prices. We get our dual 2.8Ghz Xeon, 6GB RAM, boxes from Dell for $5k after some serious discounts. The 1Ghz Sparc chips can't compete but are not too far behind. Plus I heard 1.3GHz sparc chips are around the corner.
If you want stability and manageability, and better network I/O than Linux, this might be attractive. I'd personally like to try it out as an Oracle server, when serving up data over NFS.