If you're looking to generate QR codes, you can also use google charts api:<p><a href="https://chart.googleapis.com/chart?chs=150x150&cht=qr&chl=http%3A%2F%2Fnews.ycombinator.com%2F&choe=UTF-8" rel="nofollow">https://chart.googleapis.com/chart?chs=150x150&cht=qr...</a><p>You can embed this into your webpages as images.
On Chrome 15 Win there seems to be some tiles alignment issue when browser zoom is set to something else than the default value. On the other hand recent FF and IE render just fine.