Top 10 Bookmarking Sites

1. Digg: Mammoth traffic; tech-focused; savvy users
2. Delicious: Pretty big traffic; somewhat tech/design-focused; a lot of bloggers browse Delicious for “things to link to”
3. Netscape: Pretty big traffic; a mix of topics; less savvy users
4. Stumbleupon: Medium traffic; weird stuff/literary articles; normal users.
5. Yahoo MyWeb: Medium traffic; general interest; normal users
6. Reddit: Lower traffic; politics/random stuff; normal users.
7. Furl: Lower traffic; tech-focused/some random stuff; normal users
8. Newsvine: Lower traffic; politics and news; normal users.
9. Lookmarks: Low traffic; gets spammed a lot; less savvy users
10. Blinklist: Low traffic; gets spammed a lot; less savvy users

Above list is from Aviva Directory.