London's Congestion Charge Zone*       (my experiance)
new zone map old zone area
New extended congestion charge area Old zone area

Congestion Operating Hours: 7am - 6.00pm Monday to Friday, excluding Public Holidays.
The charge is a rip off £8 if you pay by midnight on the day of travel. An additional £2 surcharge will apply if you pay from midnight on the day of travel to midnight the following charging day.

Official website here

Also watch out for-

bus/goods vehicle lanes that wrongly send out penalty notices because they can't tell the differance between goods vehicles and cars! (15/7/05)

Update to below (16/10/04)

Registered for pay by sms, much better system!

My Experiance on 20th February 2003!

I tried to pay by phone and waited/waisted 10 mins - and still had no success!!!!!!
Tried to register on website - message says (after filling in name and address) BUSY!! Could not register!!!!!!!
It took me longer to pay then the time i was in the chargeable zone!!!!!!!
Traffic was little mind you but it was before 8am!

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* whatever next!