Thanks to Stinsonddogxxx8217;s guides, I have an update for a single filter rule.
Summary: All bcc'd emails will not get forwarded. You have a single filter to get messages sent to and cc'd to your gmail address forwarded to your blackberry.net address. Items sent from your blackberry get placed in your gmail sent folder. No double post for sent items (sent items from blackberry do not get forwarded back).
This is a variation on Stinsonddogxxx8217;s first/easy filter that also allows carbon copied emails to be forwarded. http://home.comcast.net/~tamsterra/OP/Gmail.htm
Setup your blackberry.net options as described in the guide (auto-bcc, reply as..).
Disable the main forwarding option in gmail and create a filter. In the "To:" field in the filter options add "email@example.com || cc:firstname.lastname@example.org". Quotes are not needed, the double pipe means OR. Go to the next step, select forward to and place your blackberry.net address.
I started to use this and it looks good. When I reply from my blackberry the messages get to my gmail account and placed in the sent folder, but do not get forwarded back to the blackberry. Did some testing of carbon copy messages also and looks good. Limited testing with positive results.
Hopefully my first contribution will not back fire. Please try it out, watch the syntax for the filter, and post your findings.