T-SQL Tuesday is a monthly blog party hosted by a different community member each month, and this month Brent Ozar (blog | twitter) asks us to talk about data types.
Your mission: write a blog post about your favorite data type, and schedule it for next Tuesday, March 9.
Mad about money? Feverish about float? Tell us what you use your favorite data type for, and what people need to know before they get started using it.