are probably the leaders right now.
HP is probably not too far behind, although I don't have numbers to tell you if HP is selling more than Sun. But they are definitely one of the top players, and being a large hardware player, you'd probably expect better support.
Of course that is at the device level. If we are looking at the appliances, there are quite a few players. NeoScale and Decru are probably the two largest, but there a number out there that have offerings that may not be as popular.
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And when we are talking about software encryption, pretty much all of the mainstream backup products offer encryption capabilities.
Check out the entire Tape Encryption FAQ.