Needle seems like a nice dependency injection framework. If only I were writing anything cool enough to need one.

Fantastic. Set up a mail server and make it do tricks like a helpful puppy. Examples: an email proxy server that strips out garbage spam and webbugs, but lets you read your important mail, a blog that operates entirely by email, a mailing list that requires no administration…

paste your code in the box, they run it and give you a link to show someone code and output. This is how collaboration moves forward among programmers.