Amazingly, the commercial hackintosh maker Psystar (whose efforts in building non-Apple machines running OS X we've covered at some length) still hasn't been beat down by Apple Legal and now they're back for more. They are releasing the OpenServ series of rackmount servers which they offer with a variety of OSes including OS X Leopard Server.
There are two models: the 1U OpenServ 1100 (starting $1599) and the 2U OpenServ 2400 (starting $1999) either of which can be purchased with OS X Leopard Server pre-installed for an extra $155 (no clients), $525 (10 clients), or $1025 (unlimited clients). This machines are obviously in direct competition with Apple's Xserve. Frankly, I'm amazed that Psystar is still in business, and they keep pressing their luck. I wonder if this will be enough to push Apple over the edge.