These sources are included:
- RSS - RSS and Atom feeds
- Time - time and date
- iTunes - current iTunes track
- Battery - battery status
- Birthdays - birthdays from your address book
- Mail - count of unread mail in Mail.app
- Text - lines from any text file
- Selecting certain preference panes could lead to a crash.
- A rare case in which two entries would show on top of each other.
- OS X 10.8 or later