I've done the hundred days thing—not for coding but for working in my sketchbook—and it's an interesting exercise in habit building, at least for a while. The parallels to this article are interesting; the number of worthless pages I filled was significant, and I wished I'd tried doing something with more focus and flow behind it. Breaks are important but that can lead to easy excuses. But I guess more than anything it's about routine and practice and interest, so.
Link of Note
100 days of code