Startups: Loanio, Muxtape, Unigo, Vitals.com, gdgt

A periodic roundup of startup launch news from the NY-area tech media community:

• Peer-to-peer social finance lender Loanio allows co-signers to help others get credit (CenterNetworks)
• After a judge shut it down, Muxtape refocuses and relaunches as online music promotion company (Crain's New York Business)
• Creator of Students' Guide to Colleges launches college review social networking site Unigo (Mashable)
• NJ-based Vitals.com lets New Jersey residents critique doctors in the state as well as search their credentials (The Record)
• Engadget and Gizmodo editors Ryan Block and Peter Rojas are launching gdgt, a consumer electronic site that is rumoured to have a social networking component (Silicon Alley Insider)