I did the following:
1. Moved all my Safari RSS feeds to Google Reader, which has a superior interface anyway, using this tool <http://dcostanet.net/wordpress/2005/06/13/export-safari-rss-feeds-via-opml/>.
2. Deleted all RSS bookmarks from Safari. You can see them easily in the bookmarks page because they have an RSS icon.
3. Quit Safari and deleted ~/Library/PubSub. Yes, all of it. Safari doesn't seem to clean this up.
4. Relaunched Safari. One bounce.
Goodness knows how much CPU and bandwidth PubSubAgent was eating.
Also recommended, ClickToFlash <http://rentzsch.github.com/clicktoflash/> for two reasons:
1. It stops Flash based ads eating your CPU, bandwidth, and attention.
2. It makes YouTube better -- you can watch the movie directly.
I also found I had to delete ~/Library/Safari/TopSites.plist to get PubSub to stop filling up.
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