I made a web delicious-alike many years ago called Beep My Stuff that I happily shut down. No regrets, I hated it.

What I discovered was:

* amazon (at the time) will aggressively shut you down by cutting off the only "viable" access to "barcode to product" data.

* barcode databases cost a lot of money and are full of utter drivel.

* people had absolutely VAST DVD/VHS porn collections that they want to share

* there is more red tape in the US then you expect. As a UK citizen I was shocked by how sclerotic any action is in the US.

* people were and now almost completely have moved to digital "stuff" although I hope that changes.