I just released SimpleAggregator 1.1, which contains a few improvements and fixes over the previous release:

• the backend is now ready for categories (planned for the next release)
• the feedsloader script now uses threads for much better performance
• the feedsloader script now periodically cleans up read entries
• the feedsloader script now traps feed encoding errors
• added OPML import and export for feeds
• moved CSS style sheets to a common external file
• small fixes mainly to the user menu links

Thanks to Thomas Johnsen and Karsten Mueller for spotting the unicode problems in feedparser and testing various fixes. Thomas Johnsen also sent me a fix to correctly store item dates when parsing.