the best online traffic source would be SEO because this traffic are legit and for real and people will be looking at your site related to there needs. you can do backlink building, posting on forums, posting on blogs through commenting or web 2.0.
Article marketing is no doubt one of the best ways to go as these articles get read by thousands of interested readers. Another way to go is through ezines articles where your selling message is sent directly to someone else list. It is cost effective and remember your ad stands alone.
I had a blog I thought was doing really well until I found out that 90% of the traffic was coming from Google image search. No clicks, was totally useless. 80% of my regular traffic comes from search (95%+ of that is Google), the rest through links and social networks. Occasionally I'll get a massive spike from being picked up on a big site like MSN.
Every Source of Traffic is best, if converts for your Businesses. If you are sending through PPC, you can make money very fast, but you need to have money in order to invest. If you are sending traffic through Search Engine Optimization, you need to invest time to get top SERPs, and once you are at top, Search Engine Traffic cannot be beaten by any other method or traffic source. PPC is indirectly / directly related to traffic from Search Engines. But, you need to work very hard!
Depending on the type of site, another good source of traffic is your own opt in list. This is also (in my experience) the best converting type of traffic as they trust you - and online, trust is key.
joining relevant forum and placing signature there can help you out that's what i am doing right now.
Article posts - Ezine, Squidoo etc. are great for generating interest and driving traffic to a site. Also try getting into as many free local directories as possible, if you can find 'em free local and niche related directories too.
Google is king - the best source of targetted, converting traffic (for me) but I spread my bets by article marketing too. Steve.
I agree - Bing is really starting to drive traffic to my site. I'm not entirely sure how that happened, but I'm not complaining.
Search engines, as many other people have said. Not only does it provide a lot of traffic, but the traffic is quite valuable as well.
Submitting to social network sites and social bookmarking sites are among the most popular approaches to draw traffic quickly. Try it out to see if it works for your site.
The best source for online traffic is google. Just gain ranking in search engine in particular keywords so you will get high traffic from there.
I get most of my traffic from YouTube. I've built a small, but dedicated fanbase who like the commentary work I do on video game playthroughs. I'm planning to include more content on my channel to increase the gains.