Lots of Tube lines being worked on this weekend. Half will be in effect both days, the others only on Sunday.
The Circle Line between Edgware Rd and Kings X (big pain), Hammersmith/City and Metropolitan will be disrupted on Saturday and Sunday.
Jubilee, Northern and District Line closures only on Sunday, when London Overground will also have some shutdowns.
You can also now get updated London transport info on Twitter. Check out this new link and add to your mobile!