Mark Stosberg has posted a list of five power tips 
for serious Thunderbird users.
When Mark switched from mutt, he was “skeptical that any graphical e-mail program could rival Mutt for performance and efficiency, not to mention the simplicity of accessing it anywhere through a text-based console.”
But Thunderbird surprised him. Not only does it rival mutt, it offers “a number of new workflow improvements, especially easier filtering and labels.”
He outlines how he makes the most of Thunderbird’s filtering and labels to increase his productivity and offers four keyboard-enhancing extensions for Thunderbird.
He rounds his list out with “Master keyboard shortcuts” and a tip on using Unison to sync his Thunderbird folder between multiple Macs.