I believe you can search the Ultimate Sims List for Sims 1 (or Sims 1 & 2) sites. Greg will happily correct me if I'm wrong. He'd also appreciate if you find dead links, add them to this thread so he can investigate and mark them as offline.
Off the top of my head, try Parsimonious (I think that's http:
www.parsimonious.org), which also does Sim1 finds and Around the Sims (
http://www.aroundthesims.com/). Send Kate and Sandy a nice note saying you're happy they still have Sims1 stuff online; it'll make their day!
One of my favorites was
http://simsdeco.iquebec.com/ If you like the Point de diamonte kitchen set (orange wood and red countertops), I have matching appliances. Again, send Clivia a note saying thanks!