The taut line hitch is a great knot to know for lots of situations; once you learn it, you'll find yourself using it in a number of different ways. It's great for adding guy lines to a tent fly, or hanging a tarp in the woods for camping. I've used it to tie small gifts together at the holidays.
Agree, the taut line hitch is amazing and an excellent knot to know. I also love the "trucker's hitch." I often use the truckers hitch in situations where having easy control over the tightness with minimal risk of slippage is my goal. If I need to adjust it much then taut line hitch is preferred, otherwise I truckers hitch is my favorite knot (and seems magical the first few times you use it).