+This is a minor feature and security improvement version from version
+0.6.3 (release 24 Nov 2008). Notable features of version 0.6.4 include:
+
+- "private" installs won't show any data to the outside world; redirect
+ non-logged-in users to login. (See "Private" below)
+- Ability to "block" a subscriber, which forces them to unsubscribe,
+ doesn't allow them to subscribe again, and doesn't allow them to send
+ @-replies
+- Fine-grained control of subscriptions; users can choose not to receive
+ notices from other users over SMS, or IM, or both
+- support for Mozilla microsummaries
+ (https://wiki.mozilla.org/Microsummaries)
+- more efficient support for blacklisting users from the public page
+- instructions on the public page for people who aren't logged in
+- better registration instructions
+- a check for license compatibility in receiving OMB notices
+- HTML output in RSS 1.0, 2.0, and Atom feeds
+- tuned and more reliable 'rememberme' cookies for username/password
+ and OpenID logins
+- a utility for setting user passwords
+- a "ban" configuration variable to ban certain users from posting
+ notices
+- an configurable posting throttle to keep any one user from flooding
+ the site with messages.
+- fine-tuned url-shortening: only shorten if it's needed, only expand
+ certain URLs, and handle failure of URL-shortening services reliably
+- disable Ajax input for notices, subscribe, nudge, while the
+ request is processing
+- early implementation of support for Last-Modified and ETag-based
+ caching
+- initial microformats support
+- redirect on bad nicknames in URLs
+- correctly send emails in recipient's, not sender's, language
+- correct email content type
+- Change "Most Favorited" page to "Popular"
+- properly support the "since" parameter in API calls
+- Fix for changes in validate_credentials API call for the Twitter
+ bridge
+- Fix for fatal error when sending email confirmation on registration
+- Better replies for commands sent through the Ajax channel
+- Add a User-Agent string for OMB requests
+- Upgrade upstream library XMPPHP
+- Upgrade upstream library JQuery Forms
+- Code cleanup: checkboxes have proper <label> elements
+- Code cleanup: consolidated various notice-listing code in one place
+- Better support for unsubscribing from a remote user
+- Stump of experimental Facebook application (not ready for use! code
+ review only!)
+- Stump of experimental user account deletion (not ready for use! code
+ review only!)