Flash! Yeesh ...

While the "new look" yahoo mail is AJAX based, the web messenger is (woefully) Flash based. Which means it will not work unless you have enabled flash (and use an OS which properly supports flash).

Meebo (www.meebo.com) has been doing this, in AJAX, and across multiple IM systems (MSN, Yahoo, AOL, Jabber/Google Talk) for at LEAST one (quite possibly more) year(s).

Talk! about! missing! the! boat!