If you zip all of your ebooks, what is the size? If it is not too big, you can upload it to Megaupload.com and then download it.
Or, if you connect the new machine to the network, you will be able to browse the old machines hard drive from it.
On the old machine do this:
Go to start, run and enter cmd.
Type in ipconfig
You will see the IP address, go to the new machine
Go to start, run and enter this \\IPOfTheOldMachine\C$\
It will ask you to enter the account info of the old PC.
The C$ will go to the C:\ of the old machine