So the much improved yahoo webmail client has been in beta for more than a year now, and they’ve been slowly rolling it out to their customer base. If you’re impatient and want to get in on the beta without waiting, follow these instructions over on cybernews.com. I just did it now (24th, around 9PM) and it was still working fine for me. In brief this is taking advantage of a glitch in their system but it seems harmless enough, but use at your own risk.
I’ll also observe that having played around with it, they’ve failed to learn one of the lessons of gmail – yes, gmail has ajaxy goodness, but it’s also drop dead simple and loads relatively quickly. The yahoo mail beta fails on both those counts. Still, it’s an improvement over the existing yahoo webmail client.