I've now managed to read and send gmails from Bunjalloo :-)
Sadly the log in process to a gmail account is a bit strange. It uses lots of server side 302 redirects, meta content refreshes, cache-control:no-caching and some other voodoo that I haven't yet figured out. It breaks w3m as well, so I'm not alone in my frustration.
Luckily there is a work around - once logged in to the Google collective, you can navigate to http://www.google.com/xhtml and from there to the Mobile GMail portal. That works fine and has a better layout for the DS to boot.
The issue page on googlecode doesn't work yet - so you can't post an issue from within Bunjalloo. That's next, meanwhile I'm going to put out a new release.