I think there is currently a size limitation, but it can be done, that is the way the ringtone section of this site works if you email yourself a ringtone. I believe there are some 3rd party app's coming out that will be able to handle large email attachments (and save directly to a media card).
ah. i think i get it. so the onboard attachment for bb program can only handle so much? I know if you get a ringtone from online, you get an internet link, not actually an attachment. This would explain why i can see the attachment but not actually download it.