I prefer the shotgun approach. In the last 6 months: 22 releases across 8 projects (with differing levels of inter-relatedness). I've worked on 19 other projects in that period of time (this number might be low as I polled the filesystem, not perforce).
Ha, I was just giving a silly answer to what I thought was a really silly question, but I kind of agree with you about the shotgun approach, provided you're trying to build what people here would call a "lifestyle business" rather than a "startup".