I created this little utility when I lost my N80 cable in order to transfer a SIS file from the PC.
What it does is to scan a directory and serve a web page with the directory's contents. All you have to do is point your mobile's browser to the address shown (your PC's address) and download the files you want!
It's very basic for now but it does the job.
You can get it from my blog (Look at the signature, sorry, I cannot post links(yet)!)