On Sept. 1, Apple unveiled one of the largest overhauls to iTunes since the App Store debuted two years ago. Amid a handful of cosmetic changes and updates to its video services, by far the most significant change was the introduction of Ping, a music-focused social network embedded into the very core of the iTunes program.

The reviews are in, and it's a decidedly mixed bag. Some hail Ping as the future of Apple online content strategy, while others dismiss it as an incomplete service that would have benefited from a little more work. The round-up:

-- GigaOm: Why Ping is the Future of Social Commerce
-- Ars Technica: Hands on With Ping
-- Forrester's Mark Mulligan: Ping Falls Short
-- Silicon Alley Insider: Ping Has Potential
-- PC World: Ping a Haven for Scams
-- USA Today: Ping Artist Pages Invite Only
-- NYT: Apple-Facebook Friction Erupts Over Ping
-- CNET: Ping is Half-Baked