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>>110177 >>110178 Pentax and Alpha are compatible back and forth. There are some issues with old third-party K-Mount lenses fuxx0ring your camera if you try to mount it on an autofocus K-mount camera, but that's fairly minor and nonexistent if you stick with Pentax lenses.
Canon is compatible back and forth with the exception of EF-S lenses, which only mount on post-Rebel APS-C digitals. And, like Pentax, there are some issues with old third-party lenses on recent bodies. I briefly owned a 135mm telephoto that wouldn't work at anything other than max aperture on my Digital Rebel, but worked perfectly on the film Rebel. But again, if you stick with Canon lenses, you can use the latest EF lens on the earliest EOS 650 and the Mk I 50mm f/1.8 works perfectly on the 1Ds Mk III.
Nikon has the huge compatibility chart of death. If you want to fully use all the features of each lens, you'd better have a body and lens made fairly recently. And I'd bet a nickel that their medium to long term plan is to move all of their lenses to in-lens autofocus motors, which means that even the pros will have to upgrade their lenses to keep autofocus when they upgrade their camera body. So they're somewhat compatible all the way back to the 50s, but not in the same way that Canon, Sony, or even Pentax are compatible throughout the system.
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