sorry, the internal number is y.W.N.[rev].[build (if necessary)] -- forgot about tag stripping

Personally, I use y.W.N ... for the public version, and y.W.N.. internally. y.W.N is kind of useful, as it gives a date which looks a bit like a 'normal' version number... Today would be 10.8.4. I also like that the public version number can be easily converted to an integer, which compares easily: 10084 is higher than 9517. I find that version numbers are confusing for products you don't know, and seriously, for a customer, why bother? The only version they care about is the one they use... not even the next / newer / better one... which is one of the reasons we (I code web apps) are still making stuff work with IE6.