Question: I have a directory on my server at

/home/dave/www/images/site (ext3)

which I want to mount directly to my Windows computer so that I can transfer data easily via command line tool. Is that something possible?

Answer: 
If the server is local, you may want to look into creating Samba shares, which will behave exactly like a standard Windows share if configured correctly.

FTP and SCP also come to mind. If this server will be reached across the internet, I would highly recommend SCP.

[WinSCP](http://winscp.net/eng/docs/commandline) has a great command-line utility, as well as a corresponding graphical version.
If the server is located within your "local" network (i.e: not across the internet) it might actually be considerably less hassle to set up a SMB (i.e.: Windows) share on the Linux server and let your Windows box access it in that manner.

Depending on your server configuration, if may already have the necessary software (Samba) installed - check your package manager for more details.