As I recently said, I love tools like del.icio.us and gmail where I can tag things with metadata.
I think with one more level of tagging I would have almost everything that I need.
For example, I would love to be able to link tags in del.icio.us. With a web of many-to-many relationships between a tag, I could build a folder setup, or more interestingly... a structure that suits me better. With this facility, I wouldn't just have a list of tags that I can click on, but I could see the relationships.
It would then also be really nice to be able to say "if I tag it with java, also tag it as dev and programming".
Tags are nice, but for some tasks value could be had with setting name:value pairs of metadata. This could especially help with searching via the lucene/google fields.
Great stuff!
Dion
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