This supposed Mac Mini 2009 spy shot from Macrumors Forum shows the bum-side of the new small-Mac design. What's new? Besides the aluminum finish, there's FIVE USB PORTS.
There's also an Ethernet port, Firewire, Mini DisplayPort and the old style mini DVI Mac display port? Two display ports? That seems odd. In any case, if this is real, it looks quite nice—and you can probably bet it'll run with at least the new Nvidia 9400 graphics chipset found in the newer MacBook and MacBook Pros. [Macrumors Forum via Apple Insider via 9 to 5 Mac]
Update: Adjusted credit. The image actually wasn't from Apple Insider, it was from Macrumors' Forums. Apple Insider just watermarked it for some reason.