>>Reindex has 2 big problmes. First, it will not delete the existing index information, it will simply add the new index information to the CDX file, causing file bloat.
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>>INDEX creates the same CDX file bloat.
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>So, every time you REINDEX/INDEX, it simply adds the new tag info to the CDX header? Thus continually getting bigger and bigger? Yow. How messy..

There are two things here. If you add a new tag, then its information is added to the CDX header. Everytime you issue INDEX ON/REINDEX, then file itself grows in size as the old index information is not removed unless you do a DELETE TAG.