It just shows how quickly the price has risen.  It will continue going up for the foreseeable future.

I have a feeling there will be more of these sites in the future.
The ones listed look pretty good.

Anything to help keep out the scammers is a good idea.
I am not exactly clear how the third vs. fourth numbers change.
It would be interesting to incorporate WOT, ebay  or other site feedback into the system.  That way people would not have to start from scratch.

This site is also has good information:

http://bitcoincharts.com/charts

Welcome to the forum.