This duplicates, in many instances, Basecamp's look and functionality. The team at 37signals has worked hard to develop their product. While I support open source software and love WordPress, I do not condone stealing someone's hard work and giving it away for free. That's not the spirit of open source, that's not the spirit of WordPress, and it's just not cool. If you want to make a positive contribution to the community, don't just copy Basecamp — come up with something different and allow it to grow naturally through open source.