Scipy and numpy are both awesome. But I've always wondered what causes so many widely used projects to hold off for so long on the 1.0 release?
Many of us are a bit perfectionist, and therefore are reluctant to call something "1.0" because it may imply that it's "finished" or "we are 100% happy with it". This is normal for many open source projects, however that doesn't make it right. (from the post)