Cell Phones

I know you can access email from a blackberry, but do you get email messages right away like you would a text? If not, how are the notifications different?
Is it possible to receive a text but not an email if you can access both on your PDA?

i bought an blackberry curve 8520 and i want to read books on it. People recommended mobipocket and mobibook but both of them dont work on my blackberry.
Any suggestions?

How do i fix it or do i just get a new one
and plus this has happened multiple times but it always worked again

for it to arrive at my house ?
oh also i live in NJ

Some say the Blackberry goes to the server every 15 minutes to check for any data in the email, this process is called ‘Polling’ and others reveal that the BlackBerry does not poll the server to look for updates. It simply waits for the update to arrive and notifies the user when it does. What is the correct answer?

I am getting a new phone soon and I want a blackberry however my contract is too low to get a blackberry curve, so is the blackberry pearl just as good or what are the differences?

I just got a 2gb sd card for my blackberry. I know I can save about 11k photos, since thats what I read up online, but what about videos? I can record videos with my blackberry curve, and they range about 3-6 mb of data. How many videos can I save then?