Your launch is not the be all and end all, it's the beginning of a long hard slog. Look at the likes of Bingo Card Creator and Balsamiq. Why would Bingo Card Creator belong on TechCrunch? Rather than focusing on one site, you need to work on a long term plan to raise profile within your target market. The last thing you want is a load of uninterested visitors looking for the thing between now and the next big thing. If you business is relevant to it and it's ready, the likes of TechCrunch will come to you. In the meantime focus on the niches within your target market.
For example, my company sells two things - Penetration Testing and Incident Response. We're very, very good at it, but not many people know about us in our target markets because we (some might say) foolishly were a little bashful about promoting ourselves. Some of that was a product of size and structure, but most of it was that we were taking the wrong approach. We've picked a niche (GCSX CoCo Health Checks - I know, interesting stuff right?) and have started marketing it offline and online. Have a look at http://www.mandalorian.com/services/penetration-testing/gcsx... - That's one A/B tested page for one niche (GCSX CoCo Testing) within a niche (Penetration Testing) within a niche (Information Security). We're a B2B consultancy so we tend not to do things like blogging (at least so far) as it has the potential to be a time sink. Instead we focus on winning business in a target sector or niche, which is what you should be doing.
Our campaign has an initial ramp period, sustained promotion for a reasonable period and then will enter a business as usual setup. Persistence and testing is what will get you the results your after, Not Michael Arrington.