[jacquesm]

The last weeks have actually seen a number of those:

TipJoy:

http://news.ycombinator.com/item?id=776978

snaptalent:

http://news.ycombinator.com/item?id=768725

you vs me:

http://ryanleland.com/2009/08/post-mortem-you-vs-me-com/

and one more:

http://news.ycombinator.com/item?id=723834

[jasonkester]

And one of mine from a year back:

http://news.ycombinator.com/item?id=227400