A Traveller's Tool Kit For London
Offers a useful overview of the capital's bus service.
http://www.londontoolkit.com/briefing/buses.htm

Green Line
Operates scheduled coach services between London and the surrounding counties.
http://www.greenline.co.uk/

London Bus Page
An unofficial website with news and information about London buses.
http://www.londonbuspage.com/

London Buses.co.uk
If you want to find out what route a particular number bus travels, then check out this site.
http://www.londonbuses.co.uk/

London Central
Operator of public and special bus services.
http://www.londoncentral.com/
http://www.go-ahead.com/

London for Free.net
See the capital's sites cheaply by hopping on a public bus.
http://www.londonforfree.net/bustour/bustour.shtml

Plus Bus
Save on the expense and hassle of buying separate tickets by opting for this combined rail and bus ticket.
http://www.plusbus.info/

The Greater London Bus Map
Includes information about major bus routes around London.
http://www.busmap.org/

Tiscali.it
A document in PDF format that depicts the various night bus services operating in London.
http://web.tiscali.it/no-redirect-tiscali/valpix/Night_bus.pdf.

Transport for London - Buses
Official and comprehensive guide to the city's bus service.
http://www.transportforlondon.gov.uk/buses/index.shtml

Transport for London - Stationlink
Bus routes 205 and 705 cover all of London's main train stations between them. Find out more here.
http://www.transportforlondon.gov.uk/tfl/ph_stationlink.shtml

UK Public Transport Information
Covering all travel by bus, coach, rail, air, ferry, metro and tram within the UK, this site is the definitive index to timetables, fares, ticket types, passenger facilities and more.
http://www.pti.org.uk/