Earlier this week, I took part in Infinity Ventures Summit (IVS) Spring 2011 in Sapporo [this and many of the following links are in Japanese], a two-day, invitation-only event that takes place twice a year in Japan. IVS attracted over 400 people from the domestic and international web industry this time and is organized by VC firm Infinity Venture Partners (which just raised US$41 million for their IVP Fund II). Apart from panel discussions and presentations, some hours of the program gave a total of 14 Japanese start-ups the chance to present their services onstage. Here's a rundown of all companies that participated at the IVS launchpad this time.