I'll start with a description of where I am, hit-wise. My primary blog seems to average around 50-60 hits per day, according to Site Meter. So if you want to be up there with Instapundit, Daily Kos, or Gizmodo - I'm not the one to ask.
The bulk of my hits come from search engines. My blog does have a fair amount of how-to information, enough that I'm actually thinking of buying a domain name and starting a companion website where I can store the articles in a more logical format. A little homemade search engine optimization may help pull in hits.
I'll admit that I have on occasion used the key words that people used to find my blog as jumping-off points for new posts. For example, I somehow got a bunch of hits from people looking for "homemade windshield washer fluid," even though my blog didn't say anything about the topic. So I went and looked up what's in the stuff - it's mostly methanol - and posted an entry called, naturally enough, "Homemade windshield washer fluid - the recipe." My blog is now the #3 hit on Google for homemade windshield washer fluid.
The next biggest source of hints is from the message board at
the Megasquirt forum. They have a lot of people wandering in and asking very similar questions. I wrote some answers to their questions and, with the permission of the administrators, posted links to them in a sticky at the top of the main message board.
I post a link to my blog in my sig on virtually every message board that I visit. This accounts for a small but steady trickle of hits.
I leave comments on other blogs. This doesn't pull in a huge number of hits, probably less than message board sigs, but I sometimes get results from them. And if this leads to a major blog, such as Autoblog, finding my site and posting a link to something I write, this might really pay off.
There are a few sites run by others that have permanent links to mine, too. Right now one of them accounts for maybe 5% of my hits - the others, maybe 1-2 hits a month. The two keys here are the number of sites that link to you and how much traffic each one gets.