1.) Well. Nowadays, the easiest way (really!) to bring files from a PC to a Mac or vice versa is probably an adequately sized memory stick. Plug it into the source machine, copy stuff on it, plug it into the destination machine and copy the stuff where you want it to have, then delete it from the memory stick. Doesn't involve anything really tricky.
2.) You can turn on Windows File Sharing in the "Sharing" preference pane on the Mac. Then, from the Windows side, you should be able to login to the Mac using your Mac user's short-username and password. The other way 'round works as well.
I personally prefer the first option, though, since nothing has to be set up, no security risks are taken by opening services on either machine etc. - It's simple and easy to accomplish, although it's not as direct as networking. I guess it depends on what's more comfortable.
