That is an interesting question! I don't really keep count, myself; let me take a quick look...

Ok, as of today, there are 680 named keysets. Of these, there are only a few outright duplicates (such as the Grundig TV Keyset 5 I just added). (I had expected that there would be a lot of manufacturers simply copying existing keysets, but that doesn't seem to be the case.)

There are, however, quite a large amount of keysets that only differ from each other by a few commands. For these, I've been delegating one keyset as the root, and having the rest only store their differences from the root. I've labeled the branch keyset names with a letter, so they'd be "Keyset 1a", "1b", and so forth. I'm counting 173 of these right now; so, in essence, there should be roughly 500 truly unique keysets in Pierogi at this point...