I have searched to no avail....but when the new os comes out, with a mac, how do I download it? I have PocketMac now for syncing. Is that all I need?

You won't be able to.
You need Windows running BlackBerry Desktop Manager.

What kind of Mac do you have? If it's Intel based, then you should be able to use some sort of virtualization product (Parallels or VMware) to get Windows installed on it.
It'll be an expensive option, since you then need to purchase said virtualization product in addition to purchasing Windows.

Your best bet is to find a friend with a Windows computer and do the OS update from their machine.

You will need a friend who has a PC! I have helped a few of my Mac friends out. Just swallow your pride and ask them!

I have a mac laptop and desktop and went mostly mac two years ago. I still have 1 PC notebook that I keep around for my BB, and my Garmin GPS. Mostly it stays in the closet.

Garmin has a Mac program in beta. Hopefully someday RIM will follow suit.

and i keep the old XP desktop for all my Berry transfers; i couldn't even get my Mac running the L-to-the-d to receive a file from my 8320 - that's ouch i know

use bootcamp for intel based macs. it's free from apple. i think the latest version is 1.3. it could be higher.

nothing beats pure Windows; i would want a pure Mac too

Thanks to all. I suppose I'll pull out the dreaded pc from mothballs and dl bberry desktop. :(

Not to distract from the original question... but are you guys saying it isn't possible to sync the blackberry with a mac?

It's possible to sync a BlackBerry to a Mac using the PocketMac program but you can't perform an OS update or downgrade on a Mac unless you've got a dual boot running Windows. Performing an OS update/downgrade requires using the Desktop Manager which is only PC compatible.

It is sad that BB doesn't have support on a mac

Not sure what you mean by this.
The BlackBerry is supported on a Mac, by RIM and other software vendors.
PocketMac simply isn't as full-featured as Desktop Manager.

So what are blackberry users on Mac using to sync their data??

PocketMac for BlackBerry... now offered free from RIM.
BlackBerry - BlackBerry for Mac

Missing Sync from Mark/Space ... $39.95 (My personal preference.)
The Missing Sync for BlackBerry - Synchronize Mac OS X and BlackBerry

penguin, do you sync your BB with your Mac?

Not anymore.
When I did, I used Missing Sync with my G4 Powerbook.

not sure if i read it right on their site but Missing Sync doesn't have any app loader right?