Which beer or beers are associated with Lent? Are there any varieties of beer that some people associate with the liturgical season of Lent? If so, why?
Bock style beers are regularly produced for festivals such as Christmas and Lent.

The specific kind of bock for Lent is Lentenbock.  

The only one I've tried in the UK is Oates Lenten Bock.  It was a traditional Bock style, dark, sweet and strong and it was OK.  I wasn't enamoured of it enough to repeat tasting it.