Finally!! Finally Google has decided to support old legacy browsers in their still-in-beta Gmail service. Extracted from Google.com:
Not just any old computer. Actually, yes, any old computer!
Basic HTML view lets you access your Gmail messages from almost any computer running almost any web browser, even old ones (not just IE5.5+, Mozilla, and Safari). Especially great for traveling, since you never know what kind of browser that internet cafe in Siberia is going to have…
Not sure about Siberia, but I myself is a fan of text-mode browsers, especially w3m in particular. I am so excited that it is possible to check my Gmail from an ssh session! Here’s an example: receiving an Internet scam via Gmail inside putty-Cygwin (100×40) on Windows XP (classic theme).

Who needs Firefox :)
Does w3m really support XML HTTP request ?
No it doesnt. But with Gmail’s “compatible mode”, any brower, even the one without XML HTTP request support, would be able to work.
Well it worked in 2005 as I can see, but in 2009 it doesn’t work anymore !!
Does it work for someone?
Works for me in 2010
w3m –version : w3m version w3m/0.5.2, options lang=en,m17n,image,color,ansi-color,mouse,gpm,menu,cookie,ssl,ssl-verify,external-uri-loader,nntp,gopher,ipv6,alarm,mark
At first, redirection was a problem. Kept getting errors. But w3m remembers cookies. So I quit w3m, and started again and I was in gmail in an instant.
remember: http://mail.google.com/mail/h/ <-ends in a slash!
http://img535.imageshack.us/img535/9331/w3mgmail.jpg
Yeah, baby. It works. You guys rock.
http://mail.google.com/mail/h/
is not working as of today .
even
w3m -cookie http://mail.google.com/mail/h/
is not working
today (December 27 2011) checking gmail from console (linux) is working for me ;)