I've been doing the same, but chatting with PG today uncovered the disquieting possibility that making progress on my own project is making it harder to sync up with potential cofounders. I've met several good people in the last few months, sometimes with very similar ideas. It seems easier to keep pushing on what I'm doing rather than to return to an empty page..

I'm not sure what the answer is. Waiting to find a co-founder seems like a leap into the unknown.