I was thinking that something like this would be useful after I attended a friend's wedding last weekend. Wouldn't it be cool if I could type in the date/time/location of the event and be able to browse through other's photos and/or thoughts on the event? I know, what a geekish thought about a wedding for-crying-out-loud, but OTOH I took some pretty cool photos. It would be nice to lower the sharing barrier to entry to simply having interested parties look them up via google/kazaa/etc.
Hmmm. Must... acquire... gps.