I knew I'd seen a list somewhere of different heel options and finally found it. It's on ravelry so I believe you need to be a member before you can read it but if you're reading knitting/crochet blog anyway then chances are you will be! Anyways, the list is here.
I'm looking forward to having a good long list through all those links when I've got some free time and an internet connection that is ridiculously slow :-S
Today though I'm going to carry on knitting my simple socks with the Sweet Tomato heel because it helps de-stress me.