I started with FURL. I loved FURL. It made copies of all the pages I visited. Then it got acquired by Diigo. Diigo was so bad, I went to Delicious. I hated Delicious. Diigo got better, but I don’t think they copy pages. Plus, it’s a pain to go there to look up stuff (one reason why many things I’d otherwise save there are now here in Tumblr!). So, this for future reference.