OK, I felt like I have seen something on this, but I can't find it right now.

We just upgraded to BES 4.0 and all sent items are being sent to my handheld. I don't mind, but I know some users will want this disabled. How do I do this?

this is from RIM's site:

From Desktop Manager:
Open desktop manager and double-click on Redirector Settings.
Click the Advanced tab.
In the Folder redirection section, click the Selected Folders option, followed by Choose Folders.
Make sure there is no check mark in the box next to Sent Items. If there is, remove it.

From the handheld:
From the Home screen, click on Messages.
Click the trackwheel and select Options.
Select the Email Settings option.
Click the trackwheel and select Folder Redirection.
Highlight the mailbox. Click the trackwheel and select Expand.
Scroll down to Sent Items. Make sure there is no check mark in the box next to it. If there is a check mark, click the trackwheel and select Change Option.
Click the trackwheel and select Save.

Thanks, I probably found it 10 minutes after I posted this, about 3 minutes before you posted this. DANG! Thanks for the help though.