I've noticed an unhappy correlation.
Periodically spam blogs (splogs) will start harvesting my posts.
When they do that, email from kateva.org begins to be filtered into Gmail's spam folders, my Google PageRank falls, and the site is indexed less often.
When the splogs move on to another victim, things reverse.
I'm just collateral damage.
What hurts the most, really, is the decreased indexing. I like being able to search my memory collection.