Seron comes up with a new survey from MyVoice in QR Code Usage in Japan - Survey from October 2007

Q2: Do you use your mobile phone’s QR code or bar code reader? (Sample size=mobile phone users)

Often use	4.9%
Sometimes use	42.2%
Have used it before	14.6%
Know what QR codes are, but don’t use them	27.7%
Just heard the name	2.9%
Not even heard of them	7.6%
No answer	0.1%

This question was rather badly worded as it confuses awareness of QR codes with usage of them; the number of people aware of QR codes but not owning phones with decoding facilities is not determined.

Also worthy of note:

Declining PC/Mac Internet usage in Japan among the 20 to 39 age group (2000-2006). Accessing the internet through the keitai (mobile phone) becomes predominant.



Sources:
パソコン見放す20代「下流」携帯族
The Second Digital Divide in Japanese Society

Update: article from November 5: In Japan, PCs are becoming sooo version 1.0