I just ordered a couple of the stylus r us styli and I'm really hoping to like them, as they're frickin' expensive! But, like a prev. poster said, they're supposed to take a VERY light touch, so you don't have to press on the screen. I purchased telescoping styli because I've heard that it's much better to write on the iPad with a longer stylus, but I didn't want to carry a huge stick-like think around with me to class and risk it breaking or something....
I've heard the Wacom ones are very nice, a little on the short side but they feel like a real pen. I was going to buy it before I came across the stylus r us styli. Most everyone I've talked to has said to go with either the stylus r us, or a good sized RUBBER tipped stylus, as the sponge-like ones (like the Pogo) are difficult to write with and the spongey foam becomes distorted easily. Just what I've heard!