I chose 1. Although I could have answered either 1, 2, or 4.
Primarily, I found this site while Googleing for a pictured, free chemo cap pattern for a longtime friend of mine who is undergoing chemo for breast cancer. Wouldn't ya know it? In the end she opted to not make a fuss over picking a pattern and decided to wear a dollar store cap instead?! hmmmph. Personally, I think that "No Hair Day" pattern, by Sue W. Thompson at Head Huggers is just about the wildest/coolest hat I've ever seen, chemo or no chemo.
What really interested me were the pictures, skill level rating and the good overview of the projects. The techniques were also of interest (an ongoing search theme for me). After adding this site to my "Favorites" list, I came back and discovered the great tutorials (for which I have seen <some> similar at another, helpful site). I'd say this is the site's greatest asset and the early poll ratings seem to reflect it.
Additionally, I saw MANY link references from other sites to this one.
While searching I probably also saw some references that were tied to the Forums (I'm a real data digger), but I cannot honestly say I recall it specifically.