Information Efficiency ? A better way of using Gmail for GTD

(Thank you, lifehackers! This post is more than one yearold. It appears that automatic labelling is no longer working withDraft. It was working when I wrote this post. I stopped using the Gmailfor GTD a few weeks later. I am now usingvoo2do ,google desktop todo plugin andWikipad.But I am still looking for a perfect solution of integratingemails+todos in wiki (for PIM) + other todos + delicious to read +desktop files to read.)
I have been trying GTD for some time including outlook plugins,tadalist and some wiki-based ones, such as the recentBackpack andGTDTiddlyWiki. I was mainly using myWikka wiki(leveraging its dynamic category feature) for work-related complexthings and tadalist (later Backpack) for minor things. However, I amnot completely happy with any of them for the following reasons:
I want seamless email integration. Many of my todos are related to emails. All the existing wiki-ones can not satisfy this.
I want web-based universal access. Outlook or entourage allows you to turn emails into todos by one click. But you can not easily access these todos from multiple machines.
I want to be able to associate notes with an ongoing todo. Not all todo items are easy one liners with a tick in front of it. Backpack provides structured wiki. However, notes can’t be assoicated with individual items on the list.
Marking off or moving a todo in wiki is not very natural. It involves striking out things, moving things to other positions or other pages.
Then I readsome articles on using gmail for GTD.But I think it can be improved. I choose to use Draft for my own Todosinstead of sending myself an email and label it later. The main reasonsare here: 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.
I can label an email to make a GTD todo. Thanks for the conversation feature in Gmail, all future emails related to the original one will be grouped and accessible using the GTD label.
When I am outside, I can use my 3G mobile to send myself a text/image/audio todo email. If certain unique string is in the subject line, the email can be automatically labeled with the right context.
I have been using this way for 2 weeks and I absolutely love how it works so far!!