In Finder, open the folder with your file in it.
Find the icon for your file. Click once on that icon then click and hold the mouse button down on the filename below it for a second or more.
After about a second of holding down the mouse button the text will become editable and you can type over the filename.

Use the Macfusion menubar interface and you can now connect to any ftp or ssh server and save it to your Macfusion favorites.

From developers of macfuse

MacFUSE allows you to extend Mac OS X’s native file handling capabilities via 3rd-party file systems.

As a user, installing the MacFUSE software package will let you use any 3rd-party file system written atop MacFUSE.

As a developer, you can use the MacFUSE SDK to write numerous types of new file systems as regular user-mode programs. The content of these file systems can come from anywhere: from the local disk, from across the network, from memory, or any other combination of sources. Writing a file system using MacFUSE is orders of magnitude easier and quicker than the traditional approach of writing in-kernel file systems. Since MacFUSE file systems are regular applications (as opposed to kernel extensions), you have just as much flexibility and choice in programming tools, debuggers, and libraries as you have if you were developing standard Mac OS X applications

Read More on http://code.google.com/p/macfuse/