For those interested there is now a beta for Toolbar Buttons 0.45 available. The only reason it remains a beta is because it lacks all the required translations. So if you don't use the English (us) version of Firefox/Thunderbird it will not work at all. Everyone else should be able to upgrade risk free. A list of new buttons would be as follows :

• Change Text Direction
• Toggle Animation
• Toggle Flash
• Toggle Movies
• Toggle iframes (blocks some ads)
• Toggle embedded content
• Toggle Cookies
• Switch dictionary
• Toggle Popups
• Reload Skip Cache
• Show Current Frame
• Inbox Folder
• Send & Receive
• Reply to Sender Only
• Create Filter
• Skip Trash
• Edit Draft
• Return Receipt

There are also a few other betas available for download including one for the Text Formatting Toolbar. It has quite a number of new features, but none of them quite finalized. An example of new feature is the custom tags that allow easy creation of your own bbcode/wiki tags that are not in the default set.

There is also a bbcode/wiki composer for creating and storing templates, or just getting posts ready before hand. It lacks a preview feature currently so might not be of great use.

There is also a beta for AdSense Earnings but that is only "under the hood" changes that don't do anything noticeable but pave the way for some big changes