Search engine traffic is one of the best type of traffic because people have to type a particular keyword or keyword phrase to find websites related to their interests or to find websites that can offer a potential solution to their problems. So the traffic is usually very targeted and if your site appears among the top, chances are high that they will click on yours.Try to register as many as you can and notice the increase traffic on your blog(s) daily.Most of this site require you to leave a link at your blog and describe what is your blog about.Here are a list of 50 top ranking search engines/directories you can register with :

Search Engine/ Directory (Google page rank =PR)
1. Yahoo! Search (PR=9)
2. Google (PR=10)
3. Live Search (PR=8)
4. Wikia Search (PR=7)
5. Open Directory(PR=8)
6. Cuil (PR=4)
7. Exalead (PR=7)
8. MavicaNet (PR=4)
9. GigaBlast (PR=7)
10. ScrubTheWeb (PR=6)
11. What U Seek (PR=6)
12. World Site Index (PR=5)
13. BusinessSeek (PR=3)
14. ExactSeek (PR=4)
15. EntireWeb (PR=6)
16. SearchMe (PR=6)
17. IllumiRate (PR=5)
18. 01WebDirectory (PR=4)
19. Amfibi (PR=6)
20. Wikidweb (PR=4)
21. SearchSight (PR=5)
22. AMRAY (PR=4)
23. Info Listings (PR=5)
24. Domaining (PR=3)
25. Amidalla (PR=4)
26. WebbieWorld (PR=4)
27. Arakne Links (PR=4)
28. Link Centre (PR=5)
29. Pedsters Planet (PR=4)
30. SonicRun (PR=4)
31. Anaximander (PR=4)
32. Info Tiger (PR=5)
33. Dramba (PR=3)
34. Zeezo (PR=4)
35. Thales Directory (PR=3)
36. Directory Storm (PR=4)
37. A1 Web Directory (PR=4)
38. Burf (PR=4)
39. NetInsert (PR=4)
40. Web Linker (PR=0)
41. Finest 4 (PR=2)
42. Cipinet (PR=4)
43. Klottra (PR=0)
44. My Directory Live (PR=3)
45. FreshTV (PR=2)
46. ABD (PR=0)
47. SEagency (PR=2)
48. Nonar (PR=4)
49. The Living Link (PR=4)
50. Clickey (PR=5)