The idea here is that viewers can add meta-information to a page,

which could be useful for search (new keywords, ranking).  May be 

especially useful within an enterprise.

See also.

Pass in GPS coordinates, e.g., from iphone, and get lists of homes for

sale, cafes, restaurants, gas stations, etc.  Users can add information,

mark things they'd like fixed (e.g., add stop sign, fix road lights, etc.).

Users can update their location on facebook status.

Make webpages easier to read on PDA.

Keep track of the price of something at a particular website: will likely require significant customization per site.

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