I switched to GMail about 2 years ago, but I have kept my Yahoo email account around so it can forward everything automatically to GMail.
But today, because of Jerry Yang’s CES Keynote, which makes it clear that Yahoo is going to become very friendly to third party developers, and because Yahoo Mail still has more users (I think) than GMail, I decided that I would download Yahoo Go! to my Blackberry, and start using YahooMail again, so I can keep my feet in both camps.
My company email will still be GMail based, but I’ve got a ton of contacts in Yahoo that I never transferred to GMail, and there are a lot of Yahoo Mail users that I could instant message with, from the 7-8 years that I did use Yahoo Mail as my primary email account.
The Yahoo Go features on my blackberry are very impressive, but a little less intuitive for me than all the Google applications that I have on my blackberry. Yahoo installs everything as one app. Google has about 8 or 10 icons on my blackberry, and their Mobile Application updater just automatically updates their apps for me. I can delete the ones I don’t want. So in terms of taking over my blackberry real estate, the Google strategy is much better than Yahoo’s.