Bukkit

• When editing signs, you can now set the owner to yourself simply by right-clicking the same sign a second time. That is, a double-right-click while holding the owner set tool will set the owner to yourself. (Right-clicking a different sign simply changes the sign being edited without setting any owners.)
• Fixed a bug that prevented you from setting the owner of a sign to no-one.

No known caveats, but be sure to configure your database if you don't want to use SQLite and are updating from earlier than 1.7.