Delegate to Todoist for Gmail 2.0
As I hinted in the update in my last post, I discovered a very nice addition to Gmail 2.0 which allows for much better Greasemonkey integration, meaning it's possible for me to update the script.
There are now two different versions, one for Firefox and one for Safari*. The one for Firefox will work with both Gmail 1.0 and Gmail 2.0. However, the one for Safari will unfortunately only work with Gmail 1.0 as the integration point isn't exposed in Safari.
I'll work on better integration (rather than a popup window) sometime later this week. However now I really need to sleep.
* Why two different scripts rather than checking for the presence of the API? It comes down to the differences between the implimentation of Greasemonkey. Greasemonkey uses unsafeWindow whereas Greasekit and Opera use window.

Comments
Anyway, GMail integration is explained fully at todoist.com/Help/viewGmail
I started a Google Group for Todoist.com users. The group fills the gap left by the understandable decision of the developers to give support only to paid users. But it also permits easy sharing of power-user tips, feature requests, bug reports, kudos, and more. Check it out and please spread the word: groups.google.com/group/todoists
thanks a lot for this
You can try to find a greasemonkey type plugin for Camino:
http://www.google.co.uk/search?hl=en&q=camino%20greasemonkey
However, you may find you need to change the script a little bit, and most likely it will only work with Gmail 1.0 (though you may be able to get it working with a bit of browser spoofing).
If you get anything working please post back so others can benefit. I do get the fortune to play around on a Mac on occasion, so I may be able to have a look myself in the future. I'll post here if I do.
Good luck.