I'm able to view the site on my Treo700W and it looks ok. But it definitely hiccups when I look at a message that has a lot of replies, it'll bring up the warning that a script is running, do I want to abort or continue. If I stick it out, it'll come up (this has been useful since my work just blocked Multiply!) I've posted a few times from it, but mainly I'll use it to just catch up on a thread.
However, the other day, I was following a link in an email (read in gmail on my treo) and it routed me through google's gwt. That made it much much better. Check out:
Google GWT. I think you can choose whether you want images to appear or not.