Oh and Steve, since you asked earlier
Xenon (2005/2006) - launch motherboard, horrible, lasts about 6-12 months at the most before going RRoD. Hasn't got HDMI and is just generally terrible.
Zephyr (2007) - Just the same as the Xenon but with an HDMI port. Same problems.
Falcon (2008-2009) - Much better than previous revisions but still not the best.
Jasper (2009-2010) - The best motherboard, better than slims. But the JTAG Jaspers are fucking expensive.

Trinity (2010-present) - No one knows if they're better than Jaspers yet. Although people are claiming Jaspers are better.
