The F-117 is a bomber. The only thing is has over the B-2 is an even smaller radar signature, and I would guess the Pentagon has finally realized that the B-2's signature is already so small, there's just not much of a need for the 117's.
The F-22 is far from a "replacement".
The SR-71 has been replaced by the Aurora. It's a pulsejet running on methane, and goes faster and higher. I think the only reason it's not in active service right now is because of the refueling issue. Methane is exotic in comparison to JP-5 or JP-8 -- which can both be pumped from the same equipment. A specialized XKC-135 would have to be outfitted, and that thing would probably have to have it's own internal refrigeration system.
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