I have been upgrading switches at the company I work for and their technology here is prehistoric, but the new switches I have received from my director are the 3COM 2928-SFP Plus. I have been reading the manuals and doing some searching around for an explanation of exactly what the 4 1000Base-X SFP ports are used for. If someone has any good sites or a good explanation as to what these are used for and best practices with these ports I'd appreciate the information. Thanks guys.
I'm not sure what others use them for but we use them to connect switches located in different areas of the building. We ran fiber from the server room to a switch closet at the other side of the building and we connect them via the fiber uplinks.