Strangely, I often find myself with an urge to watch the original Star Trek on Sunday afternoons at about 4 p.m. It occurred to me to see if it's available on Netflix instant streaming (actually TheLimey mentioned it). So I checked, and it's there! Woo hoo! At least Season 1 is.
Except that it's only available for streaming until December 30. Dammit.
I'd have to watch 10 episodes per day to see them all.