Liming Zhu at Information Efficiency brainstorms some improvements on an existing implementation of GTD on Gmail. He mainly change to use Draft folder for his todos instead of sending as an email:
– When a draft is saved in Gmail, a filter will also be applied automatically! I use a unique short string(3 character) in a subject line to indicate a potentially long full lable and let a gmail filter to apply the lable automatically. This is closer to the way of adding a normal todo in other applications. Compared to sending an email to yourself and applying a label manually, it is much more convenient and natural.
– I often attach additional information to an onging big todo item. If I send myself a todo, it is hard to attach further information without fowarding and relabeling AGAIN every time.
A better way of using Gmail for GTD – [Information Efficiency]