A very urgent and important security release has been put out by the WordPress team. It will hopefully, and likely be the last update until WordPress 2.4.
From the WordPress blog:
WordPress 2.3.2 is an urgent security release that fixes a bug that can be used to expose your draft posts. 2.3.2 also suppresses some error messages that can give away information about your database table structure and limits and stops some information leaks in the XML-RPC and APP implementations. Get 2.3.2 now to protect your blog from these disclosures.
I suggest everyone head on over to the WordPress Download page and upgrade today. It isn’t a major revision and thus shouldn’t cause any issues, but I still recommend backing up your WordPress, as it never hurts to have a backup copy.