Calendar Picker Addin
Sam Radakovitz , the guy who created the Halo Spreadsheet(recently updated) has made an extremely nice Calendar Picker Addin.
Load it up like a regular addin, then any column with a date as the column header presents the user with a popup to choose the next date, instead of having to type it manually.
Many nice features, too bad it’s PW protected (share the love Sam!), Transparent effects, fade in, fade out, a cool Smart Tag like icon that is embedded in the cells to activate the Calendar.
One of the nicer Calendar addins available, worth the download to use, or get some ideas.