Evernote is a great note-taking service that has multiple mobile apps as well as desktop apps and web access. The great thing is that you can make notes in any of these places and it gets synced to all of the other instances. The Evernote app for Android comes with a widget bar (similar to Google Docs) that gives you one-tap access to your notes, lets you search your notes, and lets you quickly create a new note.
If you'd prefer to view this as a list instead of a photo gallery, then see the companion blog post.
