Amazon does tagging

Alan Taylor and Anil Dash report that Amazon is rolling out tags in a big way. In a discussion board message, Amazonian Blake Scholl announced that 50% of Amazon customers will see the tagging features at this time.

from Read/Write Web: Amazon Does Tagging

Another potentially huge surge in user-entered metadata.
Interesting to ponder how to integrate it.
Do you have your own separate tag cloud for your catalogue?  Do you say, "on Amazon, people tagged this book with..."?  So many folksonomies, so little time...