> Is there any reason to understand that 3.6.1 is a "stable release" (as opposed to a "security and bug fix")?
a 'stable' release is security and bugfix, so it's two ways of saying the same thing
so 3.6 is released, 3.6.x are bugifx updates to 3.6, all new development is headed for 3.7
normally, around the time that 3.7.1 is released, all support will cease for 3.6.x
"Long Term Support" kernels are ones where someone has decided to support them for a longer timeframe. Currently 3.0.x and 3.4.x are in this category. There is no firm timeframe for when support for these will cease.