When surfing the internet I start reading about Microsoft Tag Beta (of course). With Microsoft Tag you can create links with a image-pattern. The image-pattern can be decoded to a link with the Microsoft Tag program on your Windows Mobile (with camera).
You can create graphical image-patterns with the following actions:
Link to an URL
It looks very promising. Not every tag on a screen gets recognized at once, but the printed tags work very well.
I've placed my vCard in a tag on my blog. Just try to tag it 😉