Venture capital is getting nervous. And the flood of new money has become a trickle. As money dries up, startups have to tighten their belts and lower their burn rates in order to live another day. In the process, big hiring plans are shelved. The formerly rosy scenario has turned grim. Companies like Twitter fell all over each other to lure tech gurus with blue-sky compensation packages that then allowed these folks to rent or buy whatever they wanted to, and drive up prices in the process.