I use a "KRYPTONITE KRYPTOLOK" for when im at Uni and for locking at work and in City centre.
You can check it out on
ebay ~ I think theres a seller who sells the main D-Lock with a 4foot 'kryptoflex' cable included.
A great piece of kit for 20quid!!
I use the Kryptoflex Cable to go thru my front wheel, making sure i thread thru the Forks suspension crown, and back out and connect to the D-Lock. The D-lock inturn gets secured to the bike frame and sumthing solid of course. Main rule of thumb is - lock up your bike in a area where other bikes are, most theives will go for the bike which is less secured.