Though Microsoft doesn't heavily publicize OneNote, the app does a comprehensive job of storing notes. OneNote files are the only kind that the Office Hub on a Windows phone can open directly from SkyDrive. You can mix links, text, pictures, audio, video, and even ink (though the only way you can see ink is in the desktop OneNote, not in its Web or mobile versions). Google has a product called Notebook, but I couldn't get it to do much. As an alternative online note-taking tool, I would turn to Evernote, which supports mixed media and is available on many platforms.