I'm having issues also. Went from Blackberry to Droid. I have an Yahoo account which I use for business ( its actually sbcglobal.net). I need to have real time emails like I did with my blackberry. I would be able to receive emails on my phone and computer at the same time. This droid has a lag using both the gmail account and the "email" app which is set up for my sbc account. I created the gmail account and pulled my sbc email into that thinking it would pull in to my phone in real time. I have to be able to receive emails on my phone in real time without having to wait for 5 mins or more. When I am out of the office and working from home or other places I have to know that I'm getting immedieate emails like my blackberry was.
So far I like the phone, but if I can't get this fixed, I'll have to go back to a BB.