Whenever a niche gets really crowded with startups, you know that something is broken. Online invitations, which has been dominated by Evite for the past decade, is one of those areas where there is literally a dozen services trying to make it better—MyPunchBowl, Amiando, Invitastic, MadeIt, Socializr, iPartee, Renkoo, ImThere, Skobee, Zvents, Zoji, Windows Live Events. Now add Pingg. The site launched publicly last week. A little late to the party perhaps. But it starts from a very basic premise that most other online invitation sites surprisingly have ignored. Says co-founder and CEO Lorien Gabel: “We have taken the approach that the invite matters.” When you get an invite from Pi ...