I was under the impression that we could receive/send mp3 attachments and open and hear mp3 attachements w/ the curve. I would even settle for being able to open and hear mp3 attachments thru the google mail app but I cannot.

I am very dissapointed

Hi,

You may try MasterDoc by DynoPlex. It has such an option: receive an attachment, save it as file to your BB or to the network, and open it with PlayAll included in MasterDoc. For more info check DynoPlex,Inc. is a leading developer of wireless document management solutions for handheld devices and enterprise grade productivity applications for RIM Blackberry.
On the website you may download a trial (7 days full functionality) version of the application. To install it over the air in your BB browser go to dynoplex.com -> mobile -> downloads.