Depends how much you have to transfer and what you already have. Some methods:
Burn files to CD or DVD and copy them from disc onto laptop
As above with USB flash drive or other external device (card reader + card, Hard Drive etc)
If it's only a couple of very small files, eMail
If you have a home network, set up a shared area on the PC and allow your laptop to connect to it - then put the files you want to transfer in the shared area
Crossover network cable or USB transfer cable if machines not already networked
I'd probably use disc or USB drive for sheer ease of use. (Though I am currently watching something on my laptop that is streaming from the shared area on my PC).