Question for PG/HN:  Where do you think we stand on your list of "ideas"?
About three years ago, Paul penned his essay "Startup Ideas We'd Like to Fund".  Three years along, how do you think this list stands up today?  Are any solved (in part or in whole)?  Anything new you would add to the list?<p>I ask, because I remember reading this years ago and getting inspired to work on a few things (that didn't pan out).  Given the popularity of (and success of YC), it would be interesting to see what Paul and HN see as the state of the world for this list.