Development and hack of iphone - http://iphone.fiveforty.net/wiki/index.php?title=Main_Page

Discussion about marketing aspect - http://www.goodproductmanager.com/2007/07/05/what-can-the-iphone-teach-you/

For me the critical feature is tab at browser

Some other blogs
http://erik.thauvin.net/blog/news.jsp?date=2007-01-09#121
http://www.javalobby.org/java/forums/t88247.html
http://www.gotomobile.com/archives/apple-redefines-mobile-user-experience
http://www.i4u.com/article7607.html
http://www.almaer.com/blog/archives/001342.html
http://www.mobilitee.org/archives/233
http://semacode.org/weblog/2007/01/09
http://mobhappy.com/blog1/2007/01/10/iphone-thoughts-part-2/
http://techype.blogspot.com/2007/01/ipod-iphone-igetsuedfortrademarkinfrin.html
http://www.smartmobs.com/archive/2007/01/09/handicapping_th....html
http://www.thisismobility.com/blog/?p=268
http://www.brighthand.com/default.asp?newsID=12729
http://www.tuaw.com/2007/01/11/phil-schiller-shows-cbs-lots-of-iphone-features/
http://mobhappy.com/blog1/2007/01/10/more-views-on-the-iphone/