These are my personal top 5 ways to get free traffic and may not work for all users. I have gathered this information from personal experience and my traffic stats 
5. Blogs
With blogs you can generate free traffic by commenting on some of the more popular blogs or getting a few review done but make sure its in your niche as otherwise you might get no traffic or a lot of un-targeted traffic.
4. Google
Google is some users main form of traffic and you can get thousands of unique visitors from Google and other search engines.
3. Stumbleupon
Users can get a lot of traffic from Stumbleupon as there are a lot of users that use it but most visitors from Stumbleupon don’t convert and so trying to get traffic from them isn’t that important unless your only trying to get your traffic stats or alexa stats up.
2. Entrecard
This is a new website but its really good for blogs. I get a lot of visits from them when I either drop my card on someone else’s blog or when I place an advertisement on someone else’s blog. When I say advertisement I mean paying for it with free EC credits that can be earned by dropping cards or selling your ad space.
1. Forums
This has always been my best way to get traffic to any of my websites. You can either get a forum to place an advertisement on their forum, post your link on their advertisement or review boards, place a useful link on a different board that will increase your traffic but also help the forum users. My best way for forums has always been forum signatures. If you place a link to your website on a popular forum and post a lot of useful posts then you will gain a lot of traffic from them.
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I used EC, SU, Forum and blog as you said.
I have seen a great jump in traffic since I started actively posting and actively commenting on blogs as well as forums. Entrecard has done wonders for my personal blog as well.
Mee Too, Most Traffic Of My Website Is From Forums
entrecard seems to be the best as of this time. Yes, correspondence on different blogs and forums will do a lot, though sometimes it’s easier said than done.
hey, nice layout here. One comment though, I noticed that you have lots of free space in your sidebar for advertisements, I hate to see it occupied, I think it will mess up the clean design of your blog
anyways, just a friendly suggestion
happy blogging
Blogs and forums are the main sources of traffic for me. Also use a site called Link Referral which generates some good traffic.
i using forum blog as main source,i am trying to make more blog
As of now, I use entrecard and blog commenting to generate traffic.
You’re and your aren’t interchangeable. If you’re going to continue to blog, please do yourself a favor and learn the difference.
SU use to send a spike in the traffic graph but the traffic dies after just a few days .
I use a blogroll link exchange policy – to get placed on other blogs.. the “link backs” create better page rankings in google
you can view my link exchange policy at http://www.becomeamlmrockstar.com/policy