Not sure if anyone else has come across this latest bug when using Leopard’s mail client but since upgrading to Leopard every now and then, a copy of my sent mail ends up in my draft folder. My mail client is set to save Drafts to the server. Mail.app 3.0 (and now 3.1) save drafts quite often as I am composing, however it does not replace/append the draft already saved. The drafts do not disappear when the email is sent or canceled, and they remain in the drafts folder on the server (and locally cached as well) until I manually go into the drafts folder and select the tens or hundreds of drafts and delete them all by hand.  When I contacted Apple support their response was that this is a bug known to the engineering team and they are working on it for a future update. Until then, they suggest disabling the save drafts on the server, so that it saves them locally for the time being.