However, I love MacFusion's menu-bar access to my favorite servers and refuse to give this up. Time to modify MacFusion to support Fuse4X
First, install Fuse4X and the sshfs plugin. Try manually mounting an ssh file system to make sure it works:
sshfs server:directory /tmp/mountpoint
Once this works, find out where sshfs is located and replace the copy of sshfs in MacFusion with this one:
mv /Applications/Macfusion.app/Contents/PlugIns/sshfs.mfplugin/Contents/Resources/sshfs-static /Applications/Macfusion.app/Contents/PlugIns/sshfs.mfplugin/Contents/Resources/sshfs-static.bak
ln -s [sshfs_location] /Applications/Macfusion.app/Contents/PlugIns/sshfs.mfplugin/Contents/Resources/sshfs-static
As always, your mileage may vary but this worked for me.