I am a Mac user and BB works flawlessly with it. You can sync w/ entourage or ical or anything u want.
Just download the PocketMac for BlackBerry from the RIM website.
It works as well as the PC counterpart.
As for managing SD card, enable mass storage device function, then connect to USB port, you will see your blackberry on desktop as a mount drive.
As your email problem, log in to the blackberry portal website for Cingular, in the setting part, make sure the Bcc an outgoing email to ....address is empty so you don't Bcc yourself a copy of the email every time you send an email.
site is here BlackBerry Internet Service
If you want to Bcc it, you need to Bcc it to another email address that you don't check/link with you blackberry.
I recommend you signing up a new gmail account dedicated for the collection of outgoing blackberry emails.