I've just thought of something. With all the emphasis on new tech developed after the Dominion War (Which has been really cool - specially the ASDB stuff I've seen dotted about), I just realised something that might have been missed out.
The federation (And Sisko is particular) captured a Dominion ship. Now, if we assume that the ship had a dominion transporter (No unreasonable, though the chance of it surviving is less)....
The federation has its hands on 3ly transporters.
Think of the implications. Inter solar system shuttles a thing of the past, no more having to orbit a planet to beam an away team down.... the list goes on.
Any opinions?