The services like logmein, gotomypc, etc... generally have a client. For remote control they work great. For just file transfer, not quite as good. Go try
www.avvenu.com. It's awesome! It's just file transfer - but it goes both ways. You install a client on your pc, then you access via webpage. You can also allow access to a specific folder/drive to a guest for a limited time. It's a great service (for free!
They do have pay versions, but nothing I need....