RE: Great resource
Dunno if I should admit this or not, but I am the same LBR--I use that nick for everything on the computer (well, except e-bay--it was taken, even way back when I registered there).
Arthur covered the string differences very well. Only one thing I can think to add--all strings are not created equal. I have no idea who you got yours from, and hopefully it will be a good one, but I've seen folks selling some not-so-good ones. A poorly made string won't hold up as well, won't be as quiet, and will cost you some speed--I figure that goes for endless strings, but I know it applies to flemish.
Art also made a great point about the loops--I've never shot endless strings for any amount of time, and have made a total of one in my life, so I don't know a lot about them. Most folks will say that the loops are just as strong, and can make a decent argument for why they say that. I couldn't prove it one way or the other, but I do like flemish strings better. Art's word is good enough for me on the breakage.
Oh yeah--one more thing. Flemish strings (properly made) are very adjustable. I don't like to twist one to the point it bunches up when you unstring the bow, and you don't need to untwist it too much else the loops will slip, but it's not hard to see when you are going too far. If it's made right, you shouldn't have any worries at all.
Chad