When I tried to access gmail on my kindle3 by going to m.gmail.com in the browser I couldn't fill in the name and pw in the boxes, keys didn't function.
The full site showed me a screen where I could login, however after loading the site kept reloading and i couldn't access any of the mails.
Searching the web I found a link which gave me a mobile version of gmail on my kindle3. Here is the link:
http://bit.ly/g_mail.
For tasks you can use the URL
http://bit.ly/g_tasks.
The link where I found this info is
http://www.teleread.com/paul-biba/so...mail-shortcut/
it seems so that the links are using android apps which apparently work on kindle3. Anyway I now have a nice mobile gmail which looks and works great on my kindle3