At MIT I used the xwindows program xmh to read my email. It was a pretty bare-bones program, but had one really great feature. Instead of having to drag a message to a folder to refile it, you could just right-click on the folder title and it would mark it as beign destined for there. Then you could commit all of the moves in one fell swoop. Neither GMail nor Thunderbird nor Mail.app seem to have this feature, which I regarded as a genius piece of interface in what was otherwise a pretty ugle program, all told. Maybe I’m the only one who got a lot of mileage out that feature, but I can’t help but think that our modern mail clients are missing something.