Many oldies and goodies and some newies:
8. Leave highly valuable comments on other blogs in your niche. Every niche within the blogosphere is made up of a few tightly knit communities. Like all communities, so much of what is actually going on (passing links, giving tips, etc.) is all done behind the scenes through email and IM. As a result, getting integrated into some of the communities in your niche is essential to growing your blog
I'm Andy Wibbels. I'm the author of 
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Public Relations: 21 tips to launch a new blog…
Great post for those who want to launch a new blog and don’t know how to make a success out of it!