I love finding hidden tracks, at least the first time.. After that, having a 20-minute pause before the *actual* last track is just a bit annoying. Not as annoying as having "hidden track" written on the artwork though- what's the point in that?

It's also possible to have a hidden track BEFORE track 1- you can only hear it by skipping backwards from track 1. The only album I know of that uses this trick is Goldie Lookin' Chain's Greatest Hits (not folk by any stretch of the imagination, though they did sample Steeleye Span on The Maggot..)

The other really clever way of making a hidden track I've heard was on a 7" single by S'Express (this is turning into a Guilty Pleasures confession!) which had actually had two grooves on the B-side so that, every so often, instead of the track you were expecting, you got this weird spoken word sketch. Nearly jumped out of my skin the first time it came on.