>OK, now I'm totally confused. After re-reading the docs it appears that if you have a record with a key value of A, change it to B, then add a new record with key value A it won't appear in the index. However, a quick test doesn't bear this out. It seems like there is always one record in the index per key value without reindexing.

Josh,

If you have two records with key of A and delete the one that is in the index, then A doesn't show up anymore until you either edit the other record or add a new one with A.