I'm in the process of putting the final touches on an open-source framework that I hope to release in the next few months. It's something that I'd like to develop a community for and so I'm curious about what factors influence your decision to use a new framework or tool and why.

Some of the specific things I'd like to know more about (feel free to add to this):

• Types of documentation/tutorials/instruction
• Community support (comments/forum)
• Updates (blog/social media/feeds)
• Look and feel of the project website design
• White papers/testimonials
• A big feature list
• Community size
• Tools
• Ability to contribute
• Project test coverage (stability/security)
• Level of buzz (recommended by friends or around the web)
• Convincing marketing copy

Ideally, I'd like to have all of the above, but what specific features/qualities will carry greater weight in getting programmers to adopt something new? What says, 'This is a professional-grade project,' and what are red flags that keep you from trying it out?