I need to send and receive files via the internet from people with
both mac and win os. I need a very secure system as the docments
contain sensitive information.  Something easy to impelement as I have
literally hundreds who I send and receive from? I was thinking of
using PGP with our email program. Any ideas and suggestions would be
welcome but I am an advanced user but just don't have time to look
into this. Thanks in advance.

I would suggest using SSH and transfer your files via SCP (Secure File
Copy). I have no idea if MACs support theses protocols but I would be
suprised if they didn't.

There are lots of free SSH Server Software packages out there. I would
suggest Putty as a client.

Hope this helps.

Cheers brotha!