From Alex Mills Design:
Pieces is the journal application you have always wanted. Jot down the little moments, or pieces, of your life as they happen. Each 'Piece' is limited to 140 characters so you can always get straight to the point. Tagged with detailed time and location (See Note) information, you can always remember when and where each piece happened.
Extra special pieces of your life can be tagged with a red heart which will keep them safe in their own menu for reviewing later on.
View your most recent 50 pieces, or go back further by searching by month or year. Keep you deepest, most personal memories safe by using the built in Passcode feature. Email the passcode to yourself for safe keeping just in case you forget it.
A piece just too awesome to keep private? Post it to Twitter or as your Facebook status for the world to see.
While this application will work perfectly on all devices, only the iPhone 3G and 3GS will receive location information. The app will work perfectly except that pieces wont be tagged with your current location. We are working to bring location services to iPod touch users.
This application is in very active development, some very exciting features will be coming soon.