Although it took a few minutes to learn how to use Noteflight, I found it to be a very powerful tool for music notation. Even the free version provides the amateur with the tools to write music. I loved playing with this tool.
Demo video (about 4 minutes)
- Powerful, professional-quality music notation editor
- Link, embed and share scores online with audio playback
- Up to 25 scores per account
- 10+ basic instrument sounds
- High-quality score printing
- Any number of staves
- Up to 20 levels of undo history
- Import/Export MusicXML and MIDI