It really depends on the site, I have a blog site targeted at uni students in the states which gets most of its traffic from google, followed right behind by msn/live.
Only 15% of my traffic is from the search engines right now, which means that I'm doing a lot of work to push traffic. Can't wait until that percentage goes up.
Depends on the site and topic. SEO sites 74% Google the rest refferals, Forums and the rest. Sales Sites about 1/2 Yahoo, 25% Google Automotive sales, 50% classifieds,25% Yahoo, the rest spread between Google and the rest.
1. Forums 2. Traffic excess in my sig in wich you can get Targeted Keyword Traffic 3. Penny Savers - pennysaverusa.com 4 Classified Ads 5. MSN Im also a big sports fan ,so i will promote Vertical Jump programs on Laker Forums or any other NBA Forums in my signature. That's , of course if they allow you to put your site in your signature. Or go to boxing Forums and put the Vertical Jump program in my signature, or any other thing related to fitness.
I pull everything from google pretty much. About 2000 uniques a day to one site I have. Sure there's about 30 more search engines that give traffic but the amount is not even worth mentioning towards google.