Premature and a little arbitrary. While Node.js certainly is useful, and Unix is a staple, why MongoDB in particular? Why not Cassandra, HBase, or another NoSQL

Premature and a little arbitrary. While Node.js certainly is useful, and Unix is a staple, why MongoDB in particular? Why not Cassandra, HBase, or another NoSQL effort? Why is it the "new LAMP", anyway -- why can't it just be a new(er) set of tools that people use?