New requirements:

PHP4 is no longer supported (you've been warned). The new system requirements to run FUDforum are:
* PHP 5.1 or higher
* MySQL 4.1+ or PostgreSQL 8.1+ or SQLite 3.x+

Interface changes:

* A new Quick Reply editor was added with full BBcode and smiley support.
* ATOM and RSS2 syndication was added (in addition to the exiting RDF feed format).
* Quotes are now rendered with a quote icon and semantically correct cite and blockquote tags. Nested quotes are rendered in different colors.
* Code blocks are rendered with "Select all" and "Show/ hide" controls.
* Support for graphical captchas and captcha plugins (to define more advanced or site specific captchas).
* The welcome message now includes an avatar and 5-star rating.
* FUDcode was renamed to BBcode.
* The default forum header now contains a forum description.
* The "generate printable PDF" link was replaced with a PDF icon.
* Twitter integration and layout changes for social networking sites.
* Improve visual display of redirect forums (JanRei).
* Two new themes - forestgreen and slateblue.

New administration features:

* Ability to specify a minimum message length to prevent users from posting empty or very short messages.
* Ability to check for and block creation of duplicate topics.
* Improved plugin support - including on-line configuration and help call-outs. The PREREGISTRATION hook was changed and new default plugins were added.
* Process MIME encoded attachments while importing USENET posts.
* Administrators can now load (or aggregate) XML feeds into the forum.
* Allow importing of mailing list messages from POP3 and IMAP mailboxes.
* SMTP TLS support (one can now, for example, send forum messages through GMail).
* New 'Lock/unlock All Selected' button on the topic listing page.
* Global settings were re-ordered and indexed in the Admin Control Panel.
* The message compactor can now also change the character set of private messages.
* Many other Admin Control Panel improvements (too many to mention them all here).

Internationalization improvements:

* Administrators can import the latest forum translations directly from TranslateWiki.
* English messages were removed from all translations (English is now used in the fall-back chain).
* Support language-specific plural messages. For example "1 Vote" and "2 Votes" instead of "1 Vote(s)"; and "Moderator:" or "Moderators:" instead of "Moderator(s):".
* Message files can now contain comments (mainly to credit translators).
* Single quotes in messages files are now encoded to prevent them from breaking our themes.
* Message editor can now also add messages to message files.
* A new "Help/ FAQ Editor" Admin Control Panel was added.
* Updates to French (by rflores), German (by zwickyy) and Russian (George Nechaev) messages (prior to TranslateWiki migration).
* New languages added (not all 100% completed):
- [br] Breton / Brezhoneg
- [gl] Galician / Galego
- [oc] Occitan / Occitan
- [gsw] Swiss German / Alemannisch
- [el] Greek / Ελληνικά

Database changes:

* Upgrade script now supports upgrading of SQLite databases.
* The installer now supports the MySQLi (MySQL Improved) database driver.
* The command line installer now supports automated MySQLi and PDO database installations.

Fixes:

* Preserve views and topic description when merging threads.
* Restore plugin settings (changing global settings disabled the plug-in system).
* Allow users to login after a theme was removed.
* Tree View doesn't work in Internet Explorer 8.
* Support hosts that disable the syslinks() function.
* Copy the ".path_info" marker when a new template set is created.
* The FUDAPI call, fud_fetch_newest_user() should return something.
* Fix PHP warning when editing sparse themes.
* Prevent display of a confusing '0' if no accounts are pending approval.
* Force charset with AJAX get (tree view messed up non-English messages).
* Unprintable chars after search abstracts (non-English forums).
* Fix URL avatars.
* Specify column list when selecting data to ensure we get it in the right order. This will fix several restore issues.
* Uninstall script will now drop the forum's database tables.
* Some mail sending fixes.
* Many more as can be seen from the change log.

ALSO:
- New translations added for Arabic, Esperanto, Hungarian and Upper Sorbian.
- Remove redundant 'charset' files - inherit them from english.
- Improved locale selection (try to always pick a UTF-8 locale).
- Optimize queries for the forum's XML Feed (faster).
- Support MySQLi (MySQL improved) persistent and socket connections.
- Add forum signature for aggregated feed posts.
- Word-wrap message