If you're using M$ Win 2K server you have the option of WebDAV, but the security issues are pretty onerous - so much so that when I needed a similar functionality I installed/configured it [in desperation], then removed it again b/c the risk isn't [in my view] worth it.
I got around the problem by having users access a specific folder on the network, then have written a batch file to poll the directory every five minutes, compare its contents against a dir on the weberver [via ftp] and then upload any new material.
Thus, my users can upload content to the server even if they can't spell "ftp" - or "http" for that matter. It's just drag and drop. And, when the FinDir clears my request to purchase WSFTP server and client package, it'll be transparent _secure_ drag and drop, with the [l]users here none the wiser, and the would-be hacker types, similarly, none the wiser. =)
Don't know if this'll help you...