If one of your columns is set to Date format in Omni Outliner 3, typing "next week," "last wednesday," etc., will enter the actual real date, in the format specified in your preferences. This is great for making to do lists
I tried it in the Pro version, but I don't see why this would be a Pro-only feature.
[robg adds: This works in the standard version, too. Just make sure you use the contextual menu to set the column type to Date.]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20050203082632913