What’s the best phone or PDA for helping you keep track of appointments, schedules, checking email, etc?

I’m starting a postgraduate degree and a new job in the next two months, and I need a way I can keep track of appointments, meet deadlines for work and school, check email while commuting, etc

Blackberry, latest Nokia phones are the best gadgets nowadays to keep up with your busy lifestyle. Its a matter of organizing your activities and putting it on your mobile reminder’s list to keep you posted. In emailing part, as long as you have good data plan with your phone, you can be online anytime and anywhere.