There is some good advice in this piece on Wired News about best practices for tagging posts. My favorite is

"Utilize the KISS (keep it simple, stupid) system," D'Agostino added. "Don't try and tag a bookmark with the first 20 tags that come to mind."

To me, posts which have 8, 10, 15 tags are less useful because they attempt to tag every concept that might be in a post rather than providing the most relevant.

Meanwhile, please take a look at this and the rest of the advice if you post regularly to Kairosnews. I'm hoping that in the spring we can move to a free tagging system here on Kairosnews. Would it be worthwhile to discuss this advice and begin describing our own best practice ideas?