It represents much of what I do.

As h8... says, I like the FW:, (or RE:), but only one. If as Susan suggests you are in a case where there are more than one, then I will cleanup the "extra" ones.

For long discussions that have been forwarded many times I will often trim the oldest parts that are not relevant to the current points being discussed.

I agree with jbenton, when forwarding to more than one person I always use BCC if they are not all part of the same project. I would make that item number 6 in the list.