It's nothing to do with scalability of web applications but for those of you out there that like to dream big here is a big target for you! Google will give you $30,000,000 to the first privately funded organization to successfully land a rover on the moon. This is like the recently awarded $10 million Ansari X Prize for private space flight. This definitely deserves an interesting things post and it will take some scalable and reliable systems to get there.