Take photos with your phone and email them to your MyTago account where all your images have their own public URL, it will even OCR text from an image.
Make a tag (a type of barcode), then you can put this barcode on your blog or on a poster in the real world. People can then click this tag to find out some information. In the real world if you see a poster with this tag (barcode) on it, you can take a photo of it then email it to your account or upload it to your PC.
Then when you get on your PC, you decode the tag, and it will give you information about that poster. Each tag also has a number string, so alternatively you can jot down the numbers and when you get to your PC, type in the numbers to decode (you can also email these numbers to your account, which is handy if your phone doesn’t have a camera).
NOTE: It will allow you to upload the photo to your favourite photo service, when you want to decode it, just go to MyTago and enter the URL of the photo from the photo service you have bookmarked it in.
Or if you sent the image to MyTago first, when you’re done you can then decide to upload the image straight to Flickr from within MyTago.
Your created tags
Each of your Tags (barcodes) has a public page and an RSS feed, and people can leave comments.
As I mentioned earlier you can add a Tag (barcode) widget to your blog, so it works in the online world as well as the offline world (I gather you can just click on the tag image in the online world).
Each tag has statistics and you can edit the icon and colour.
[ADDED: There is a mobile web version for your phone so you can find out more about that poster right there and then…but it would still be good if you could email the barcode number to MyTago and it would SMS you the information, similar to TextMarks.]