I am getting ready to order a chain ring and they list some with shift pins and some with not. Click here. I am ordering the middle ring on a MTB triple.

So which do i need? With or Without Shift Pins?

Why not email Sheldon Brown? It is his shop, and he seems very helpful.

For a middle ring, I'd get one with pins unless of course you're adverse to modern shifting enhancements for some reason.

You need either one, but the one with pins will shift faster and smoother, especially under pressure. So unless you save a bundle by buying the "pinless" one, buy the one with pins.

I bought a pinless middle chainring for my good road bike, but that's only because I hardly ever, ever use the small chainring. If you use the small chainring wtih any frequency, then it's worth getting a chainring with shifting pins. Especially if you have indexed front shifting, this becomes almost a necessity. If you've got friction front shifting, not so big of a deal. With a hybrid, I suspect your front shifting is indexed.

Newer front derailleurs, especially Shimano, tend to have less "lift" in their travel. The shift pins (and ramps) are designed to compensate for this, and they do make a difference.