Regular Beers: These are available on a permanent basis.
Seasonal Beers: Summer and Winter beers.
Monthly Specials: These are available in the stated month while stocks last.
Occasional Beers: These are brewed if and when I feel like it.
Single Hop Beers: Single varietal hop beers, brewed if and when I feel like it / can get hold of the hops.
Obsolete Beers: Things that have been brewed in the past but are unlikely to ever be brewed again.