Tags are foregin keys with no corresponding primary key structure. Using a foreign key implies creation of a primary key, if it didn’t exist before. The resulting nebulous collection of keys is often visualized as a tag cloud.
Those who worked with me have seen it — my trusty ol’ notebook. Now you, the reader, can also peek in on the latest ideas brewing. Experience tells me that about 60% of these will be obsolete or deemed definitively crazy shortly after being doodled down, but some of these may just be the next big thing. For what it’s worth, here it is. I am addicted to them darn Ampad Computation Books. Good graph paper, rounded corners, stamped page numbers, hard covers — what else can you ask for?