There's an adaptor for DVI to Apple's proprietary plug, it's under $100.
The Apple 22" Cinema display is the absolute worst one you can buy around that size:
180nits brightness, when most even cheap current generation LCD's are at 200nits or brighter, with some approaching 300nits.
300:1 contrast is near the bottom of the current generation. The Viewsonic VG191 is 500:1.
For it's huge size, it only uses 4 CCFL backlights. That's why the brightness is so uneven on these compared to other LCD's. Only 15" LCD's use 4 CCFL's these days. Larger ones need more, so most use 6 or even 12.
They're too embarrassed to publish their response time, but it's easy to discover. They buy the panel off of Lucky Goldstar:
Lucky Goldstar Electronics LM285A
It's a pathetic 60ms. If you want to use this poorly performing panel, you might as well buy the Lucky Goldstar one. It comes with VGA, DVI, S-Video, and Composite inputs already, and costs about the same.