One issue is that you probably created something that had a discrete 'idea' behind it. I find if you just start coding 'the project' but aren't constrained by

One issue is that you probably created something that had a discrete 'idea' behind it. I find if you just start coding 'the project' but aren't constrained by a specific idea, but remaining in the same codebase, it is liberating and allows you to cross the 4 week gap. 37signals talked about this when creating basecamp, they mastered a small messaging app first. These days probably half of all web apps could start that way.