I've been having problems with the filesystem on my N900. The permissions are set incorrectly on the cutetube.py file, so it won't launch. I'm sorting it out now.
[Desktop Entry] Encoding=UTF-8 Version=0.1 Type=Application Terminal=false Name=cutetube Exec=/usr/bin/python '/opt/cutetube/cutetube.py' Icon=cutetube Type=Application X-HildonDesk-ShowInToolbar=true X-Osso-Type=application/x-executable