I never remember numbers and version numbers are a good example of figures I can’t keep in my head! 

I found this post on a blog which give a comprehensive list of SharePoint versions and updates. 

 http://www.sharepointdesignerstepbystep.com/Blog/Articles/How%20To%20find%20the%20SharePoint%20version.aspx

It lists all of the updates for MOSS and WSS 2007 along with what version number the update is.   Very useful for those days I can’t remember if an update had been installed or not.