I was looking through the sites and they are all wonderful, I'd just like to make a brief mention of some of my favorite sources which have served me well and haven't yet been mentioned. If you are as clothes, hair, and fashion-obsessed as I am, you'll get a kick out of these sites.
All About Style -- beautiful themed outfits with meshes included, including a variety of lovely Victorian clothing and classic 20s-70s clothes and much more; I highly recommend them. It's also free!
Liana Sims 2 Great source for trendy clothing and drop-dead gorgeous fashions.
Peggy Sims 2 -- a paysite with gorgeous downloads (good hair) but also hosts a variety of equally good quality free downloads (the hair!) in the free area which I've posted.
I found out about two of these sites from Kristine (AKA Charis), the creator of the Sims 2 series Vanity High, on Youtube.