Updated to SeaMonkey 2.33.1 (release), but should be compatible upto 2.36 (nightly).
Contains all fixes from FF and TB updates (2.0.27)
Extended styling for Chatzilla
Improved handling of toolbarbutton icon/text modes
Added support for reminderfox
And a great many other small fixes and improvements.

Updated to SM 2.36
Fixed aboutPrivateBrowse panel
Fixed toolbarbutton alignment (label after icon/small/large)
Fixed ABP toolbarbutton
Improved calendar printing
New addressbook icons
Display Contact Photo extension: Improved layout for contact photo's in message header and chat pages.
newmailalert: improved layout and nicer icon.
messagebody: correctly set spacing.
multimessageview: use messagedisplay font for the messages.
messageview: improved layout of header
Consistant image for buddy picture across messaging and chat.
Improved layout for invitations in message display and print.
Improved layout for task display.
Extensions: Removed old stuff from extensions.css
Extensions: color icon on mouse hover of addons
Improved spring icon
Overrule Linux images-in-button setting to always show button icons
Fixed tooltip margin
And lots of minor improvements (from the FF/TB builds)

Version bump to 25.0
Move the audio volume bar in audio/video within the controlbar itself.
Use consistently same fonts for monospace and add Menlo for Mac.
Fixed about:privatebrowsing, about:neterror and about:certerror
Bug 842439 - Improve style and rearrange content of the about:privatebrowsing page.
Fixed feeds icon in urlbar.
Fixed search link in awesomebar dropdown list.
Bug 920677 - Click-to-play plugins fail to show placeholder after resizing
Fixed fullscreen for html video
Fixed close button in sidebar
Walnut/walnut2: fixed tabbox borders in messenger
Fixed profile selector dialog
Fixed about:privatebrowsing, about:neterror and about:certerror
Nautipolis: more consistent focus bar throughout (outline->box-shadow)
Bug 362933 - Event dialog: Customize Toolbar dialog should offer more buttons for functionality
Messengercompose: Move "to:" field close button to the end. Improved person icon
Messengercompose: improve layout of addressingwidget.