libpurple
* Fix --disable-avahi to actually disable it in configure, as opposed to just making the warning non-fatal.
* Fix using GNOME proxy settings properly. (Erik van Pienbroek)
IRC
* Fix parsing of invalid TOPIC messages. (CVE-2009-2703)
MSN
* Sending custom smileys in chats is now supported.
* Ink messages are now saved when using the HTML logger.
* Fix a crash when receiving some handwritten messages.
* Fix a crash when receiving certain SLP invite messages.
* Chats with multiple people should no longer spontaneously disconnect.
XMPP
* Prompt the user before cancelling a presence subscription.
* Escape status messages that have HTML entities in the Get Info dialog.
* Fix connecting to XMPP domains with no SRV records from Pidgin on Windows.
* Fix typing notifications with Pidgin 2.5.9 or earlier.
* Fix connecting using BOSH and legacy authentication [XEP-0078].
* Adding buddies of the form "romeo@…/Resource" are handled properly. In addition, it is no longer possible to add buddies of the form "room@…/User", where room@… is a MUC.
* Don't crash when receiving "smileyfied" XHTML-IM from clients that don't support bits of binary (ie. when getting an empty <data/> in return)
* Fix bug where SSL/TLS was not required even though the "require SSL/TLS" preference checked when connecting to servers that use the older iq-based authentication. (CVE-2009-3026)
Yahoo!/Yahoo! JAPAN
* Accounts now have "Use account proxy for SSL connections" option. This option force-overrides the account specific proxy settings for SSL connections only and instead uses the global proxy configuration.
Finch
* Properly detect libpanel on OpenBSD. (Brad Smith)
* Remove IO watches in gnt_quit. (Tomasz Mon)
Pidgin
* Fix the auto-personize functionality in the Buddy List.
* Set the window icon for the media window to an icon corresponding to the type of call (headphone or webcam).
* Customized sound files are no longer reset whenever opening the Preferences dialog.
* The buddy list should now immediately refresh upon changing the icon theme.
