The newly released Thunderbird 2 was promptly BoingBoinged: Cory Doctorow calls Thunderbird "free, kick-ass email" and shows that Thunderbird is the best mailer out there, for the average and not-so-average mail user:
I send several hundred emails a day and receive at least a thousand non-spams every day. I need an industrial-strength mailer, and I get it from Thunderbird. I love it.
Thanks to Cory for the nice review and thumbs up to the Thunderbird team for their latest and greatest release :)