I've spent the past few months building the mobility solution for G's marketing as part of my role at Anglia Business Solutions (www.angliabs.com)
Microsoft have just filmed this as a mobility case study, with some impressive ROI stats like the £50k solution saved £10m in the first year.
Video is at
http://private.angliabs.com/webextension/video/Gs_marketing_prog_evo13a.wmv
A description of the supermarket label check solution can be found at -
http://www.angliabs.com/news/GS0506/
Building the tools and designing the solution is what earned me the title of BCS Developer of the Year.
+ of course this wasn't a solo mission. Neil Robertson, Tony Rose, Trevor Hurley, Dave Missen, and the crew at G's were all very much key parts of pulling this together.