Hi all, new member here, but would like to share some tips/advice with you since I saw a post about this below.
1) Stumble Upon
This is a great tool to get the initial surge of traffic to your blog. You can either participate in Stumble exchanges (the free option) or pay for some stumbles. I have done both in the past and it is perfect for the first few weeks of your site. Write a quality post and target stumble upon to it. Its a great start not only because of the huge traffic surge (Had 1000+ Uniqs. in a day in the past) but also because it shows you how your site is performing initially. You can see, with the aid of a stats program, which pages perform best and areas you need to improve (i.e. High bounce rate etc.).
2) Link / Banner Exchange
Those 125x125 buttons are all the rage at the moment so make the most of it. Get on the forums and exchange them! I recommend the Spottt scheme for initial traffic again I have had a lot of success so far with it on new blogs. They also bring exposure to your sites image and name. Also look to get some text links as they will help your SERPs in the future.
3) Youtube Marketing
This is perfect for celebrity/entertainment/fansite blogs. Get a high impact title or some famous names (See my Sig Video) and you will get the video views. Then all you need is the URL embedded in the video and in the description and the traffic will be heading your way.
4) Blog Comments (particularly Do-Follow)
Find blogs in your niche and get commenting. DONT SPAM as you will get nothing, but participate in a friendly way and people will click your link in your name/comment. You also want to look for Do-Follow blogs that allow SEs to index your blog from these links. A good place to find them is here:
No Nofollow | I Follow | DoFollow community @ BUMPzee!
Then look under your niche's tag.
5) Forums
Get on forums to do with your sites content! So if you write about Britney Spears then join a celebrity forum, or if you write about High end Graphics Cards join an overclocking forum. Then again its about posting quality content and NOT SPAMMING. After a few posts put a link in your sig, and people will naturally be intrigued to click.
These are just a few of the many ways to get that initial boost of traffic to your blog. Providing it contains high quality content you can expect people to return and the link developing you are doing all the time with this is also booting you up in the SERPs to get that long term sustainable traffic.
Hope this was useful to at least someone, and any questions I would be happy to answer.