I don't know yet about the Google /yahoo switch, but will post back tomorrow or so after I have played with my sister's Aria... I think you are limited to Android Market only apps, but the main issue seems to be the bloatware they have added that you apparently can't uninstall. I am pretty excited for the Captivate though, and can't wait to play with it, if it is still decent it might be my next phone. (I don't mind the blackberry-ish style, it is better than the wannabe iPhone look). After I toy with that Aria, I will report back what I notice is different...