I think they advertised this here some time back, but I wanted to let everyone how happy I am with my stylus from PDAPanache. I've been using pocketpc phones for years, as well as a host of other stylus using devices, and was sorely dissapointed when I picked up the basic DS stylus for the first time. It has no weight to it, and it is not comfortable in the hand. I purchased several from gamestop etc to try different kinds, but they are all just plain cheap.
Anyhow, check these out here:
It's got a lot of weight to it, and I mean surprising amounts. It feels as heavy as a full length PDA stylus, which to me makes it very comfortable and balanced to hold. The finish on it looks even better in person than their pictures show it. Anyhow, if you have been looking for a good stylus this is the one. Fits perfect inside the DS, looks great, and the tip is very nicely made. 15 bucks, and worth every penny.