Maybe not rely upon but it is a good one time thing that you can get your name across multiple tech blogs, hard to get that much attention so fast without the blogs writing about you.
If you have something interesting to TechCrunch's userbase (say, a SaaS aimed at developers), then I could see that, but otherwise, I've found it much more productive to get written up on a moderate-traffic blog in the right niche. E.g. 5,000 people who care about, say, cooking, are way better than 50,000 TechCrunch hits, if you have something to do with cooking...
