Hop info help

I'm pretty new to brewing and use those evil Coopers kits mostly but usually have found that if you tinker with them a little you can come up with a pretty good beer. I dry hopped my last batch of bitter and it seemed to remove that "twang" as it seems to be called here. I don't know if it is because I left it a little longer in the secondary or if it was the hops but it definately helped.

So here is my question. After doing a search here I didn't spot a good list or link to some info on hop varieties and the aroma or flavour that they would add to my beer.

Could someone point me the right direction?

Just did a quick Google search: Hop Characteristics