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[kamil]

Default sshfs and fuse installs on Ubuntu Gutsy lack adequate permission settings. As a consequence you may not be able to sshfs mount remote directories.

$ sshfs server:/path/ /mnt/path/
fuse: failed to exec fusermount: Permission denied

To fix the above output run:
$ sudo chmod +x /bin/fusermount

Running the sshfs mount again results in another error:
$ sshfs server:/path/ /mnt/path/
fusermount: failed to open /etc/fuse.conf: Permission denied

The following line can be used to fix
$ sudo chmod a+rwx /etc/fuse.conf

Note that you may have to redo these steps after reboot or place them is any of the start-up files.

[QuantumKnot]

That's interesting. On Fedora (the best of the best), the only thing you need to do is add yourself to the 'fuse' group (as fusermount belongs to the 'fuse' group and has executable permission set)

[kamil]

duhhh, the 'add to fuse user group solution' can be used on any distro... even on the inferior ones