Tourism:  

Visit Britain <http://www.visitbritain.com/>.

Totally London <http://www.visitlondon.com/>

This is London (Evening Standard) <http://www.thisislondon.co.uk/home/>.

Street Sensation <http://www.streetsensation.co.uk/>.

Time out <http://www.timeout.com/london/>.

Shopping:

Londontown <http://www.londontown.com/shopping/>.

Londonvisions <http://www.londonvisions.com/main_shopping.htm>.

Hotel: 

Royal National Hotel <http://www.imperialhotels.co.uk/royal.htm>.

Baggage: 

<http://www.britishairways.com/travel/baggag/public/en_us>

Weather:  

Totally London <http://na.visitlondon.com/info/weather>.

BBC <http://www.bbc.co.uk/weather/5day.shtml?world=0008>.

Currency Conversion:

<http://www.xe.com/ucc/> or Yahoo <http://finance.yahoo.com/currency?u>
Remember to use British Pounds (GBP) and US Dollars (USD);  take note of which way you are converting--the dollar is worth less than the pound.  In January it is about two US $ to one GB £.

Destinations: 

Royal Residences, Windsor Castle <http://www.royal.gov.uk/OutPut/Page557.asp>;  Windsor Castle and St. George's Chapel <http://www.windsor.gov.uk/attractions/castle.htm>.

Historic Royal Palaces <http://www.hrp.org.uk/> (includes both Tower of London and Hampton Court).

Tower of London: Royal Armories <http://www.royalarmouries.org/>;  unofficial:  <http://www.toweroflondontour.com/>.

Hampton Court Palace <http://www.hamptoncourt.org.uk/>.

Leeds Castle <http://www.leeds-castle.com/goto.php>.

Canterbury <http://www.canterbury.co.uk/>; <http://www.canterbury-cathedral.org/>; <http://www.theheritagetrail.co.uk/cathedrals/canterbury cathedral.htm>;  .

Dover Castle <http://www.theheritagetrail.co.uk/castles/dover castle.htm>.