free tagging

Hi there

I'm looking for some advice on taxonomies and tagging.

I've got a main site taxonomy that users can add to and can select multiple terms.

This works well up to a point - I've been tagging stuff and have created blocks such as 'related events' which appear on pages that share the same taxonomy term.

Obviously there is a tipping point where you can end up with too many 'related items'. Events or news for example can be limited to those that are current.