@waterskier (sic), dude, you really need to either learn more about Apple and Mac. Until then let others speak to this. Not to be rude, but your statements are so way off base, there’s no fixing them.
10.6 is “Snow Leopard”. 10.5.6 is certainly on the drafting board somewhere, but since Apple hasn’t even dropped 10.5.4 yet, there’s no one talking about it. Apple tends to release new major OS updates, on average, about every 18 months. How high the “dot number” reaches has no bearing on that whatsoever.
The rumor is that 10.6 will be for intel-only platforms and that it will not introduce any major new functionality.
John Gruber sums it up nicely…
In short, if you’ve ever wished that Apple would spend more time focusing on making existing parts of the OS work better rather than adding new features, this is going to be the release for you. Sounds great to me. A big part of the effort, from what I’m hearing, is unifying the various branches of OS X at Apple: Mac OS X, iPhone OS, Apple TV, etc.
There’s no good version number to describe a release like this. Based on previous Mac OS X version numbers, “10.5.5” would mean “the next minor bug-fix update after 10.5.4”, but “10.6” would mean “major new feature update”. This release is neither of those things. Mac OS X 10.1 is the most analogous fit, historically.