I felt that this abstract is interesting, and that the central idea of tagging is useful and presents an interesting idea. I did tend to feel, though, that the writing on page 1 requires some revision to improve clarity of meaning. This is a very visual idea, and you need to make sure that the reader can understand what you mean, in the absence of images. 

Also, did you feel that this would be useful as a planning tool, as a design tool, or as something quite different?

Overall, I feel that the clarity of writing requires a major proof-read, as many of the central and initial ideas appear to be interesting, but are very difficult to follow.