Theatre Links
Here are a few links to other sites where you can look up information about pub theatres. While they don't specialize in pub theatres, they do have information about shows if you search by venue.
Theatre Pages
Bush Theatre (Home page for the Bush Theatre, includes basic information about the theatre and listings for upcoming shows.
Etcetera Theatre (Home page for the Etcetera Theatre in Camdem, includes basic information about the theatre, listings for upcoming shows and info about renting the space.
Finborough Theatre (Home page for the Finborough Theatre, includes basic information about the theatre and listings for upcoming shows.
Hen and Chickens Theatre (Home page for the Hen and Chickens Theatre, includes basic information about the theatre including contacts and listings for upcoming shows)
Tricycle Theatre (Home page for the Tricycle Theatre and Cinema, includes lots of information about what is playing, the theatre, children's events, etc.)
Landor Theatre (Home page for the Landor Theatre, includes lots of information about what is playing, the theatre, etc.)
General Theatre Related Links
British Theatre Guide (Web Page dedicated to British Theatre edited and created by Peter Latham. This site used to be a part of the "About.com" portal until that site folded. The site has links to many pages about British Theatres)The Stage (Web Page for the British theatre industry magazine)
Fringe Report (Web Page dedicated to Fringe Theatre in the UK. The site provides lots of good info on the London and Edinburgh fringe scenes and lots of good links)
London Theatre (Web Page dedicated to information about all kinds of London Theatre)
Rogues and Vagabonds (Web Page dedicated to British Theatre. Has information (mostly links) including theatre news, info about theatres, reviews, awards, etc.)
Tranquility Base (Web Page dedicated to theatre professionals in the UK, mostly useful for links, resumes and providers of services to theatre folk)
UK Theatre Web (Web Page dedicated to theatre all over the UK--has excellent listings if you know what theatre or play you are looking for)
Other Useful Non-Theatre Links
London Nights (Directory and reservation service for discounted London hotels)
1st London Hotels (offers a listing of apartments and hotels in London and the ability to check availability online.)
Easy London Hotels (Easy and discounted London hotels reservations.)