WordPress 3.1.1 is now available. This maintenance and security release fixes almost thirty issues in 3.1, including:

Some security hardening to media uploads

Performance improvements

Fixes for IIS6 support

Fixes for taxonomy and PATHINFO (/index.php/) permalinks

Fixes for various query and taxonomy edge cases that caused some plugin compatibility issues

Version 3.1.1 also addresses three security issues discovered by WordPress core developers Jon Cave and Peter Westwood, of our security team. The first hardens CSRF prevention in the media uploader. The second avoids a PHP crash in certain environments when handling devilishly devised links in comments, and the third addresses an XSS flaw.

We suggest you update to 3.1.1 promptly. Download 3.1.1 or update automatically from the Dashboard → Updates menu in your site’s admin area.

Our release haiku:

Only the geeks know

What half this stuff even means

Don’t worry — update

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