SAN FRANCISCO -- Internet start-ups and venture capitalists are back in vogue in Silicon Valley. But now the two don't necessarily go together.

Consider Flickr, the innovative online-photo service launched by a small Canadian company early last year. Like many Web start-ups today, it was built on a dime: Husband-and-wife founders Stewart Butterfield and Caterina Fake used cheap software to construct the Flickr site, eschewing pricey computers. Some gear, such as computer storage, was "about 100 times cheaper" than it would...