Yes, I do. Windows 7 does (it does TRIM).
Windows 7 does TRIM with an update from INTEL which they have now pulled because of issues with data corruption.
Windows 7 can only use TRIM if the storage driver, storage controller and ssd support it which is the biggest problem right now: a few drivers support it, only the Indilinx Barefoot ssd's do TRIM as Intel pulled its TRIM-supported firmware and there are no RAID controllers that can do TRIM, so for some it's useless. Doesn't really matter as garbage collection techniques are used instead of TRIM. Those garbage collection techniques are getting better and better, some are that good you don't actually need TRIM (it is a nice addition though).
It would be nice if drivers, ssd's and controllers start to support things like TRIM but that just takes quite a while. Until then it really does not matter if the OS supports it or not. In other words: there is no need to put it in the 10.6.2 update, putting it in the 10.6.4 update is probably better (we should have some more support by that time *wishful thinking*).