One gap I've found is that there appears to be no app out there to analyze QR codes for malware, outside anti-virus software.
In response to this, using MIT App Inventor, I have created an app which uses VirusTotal.com's API in order to submit QR code URLs for scanning.
Note that this app does NOT address possible security flaws with QR codes themselves. However, it does submit any URL a QR code contains to VirusTotal, and provides a link to the resulting report.
I encourage you to try out this wonderful new app.
The latest version can be downloaded here:
http://code.google.com/p/caffsec-malware-analysis/downloads/list
Source code is also available:
http://code.google.com/p/caffsec-malware-analysis/source/browse/trunk/tools/QRAnalyzer
