Some links

http://www.engadgetmobile.com/ - News source for new mobile tech and hardware
http://www.entmag.com/news/article.asp?EditorialsID=6135 -Wireless connectivity options improving dramatically.
http://pukupi.com/tools/codeatron/ - Make your own QR codes.
http://socialight.com/ - Share location based photos and notes with your phone. Ubiquitous computing, phone as information collector.
http://www.accele.co.jp/k/k-cab.htm QR cab thing... "a service which sticks QR codes embedded with a URL containing locational information on vending machines. Prospective passengers scan the QR code with their mobile to connect to a taxi web site which then dispatches a taxi to their location."