I would just like to say that Spelunky is one of a few really good games I've played in 30 years of gaming. 

Why is the procedural level generation thing so hard for so many people?  It's the reason why many old games (Nethack) have replay value.  With modern games you run through them once or twice and you're sick of it.

Planned obsolescence anyone?

Mad props to the designer, you did a helluva job on this one.