You need to be careful here. When Dell (and maybe other manufacturers) talk about trunking, they do not mean the same as when Cisco talks about trunking. What Dell calls trunking, Cisco calls EtherChannel.
But to answer your original question, yes you would get a theoretical maximum of 200 Mbps in each direction. But it will all depend on how each end of the link decides to distribute its transmitted the traffic between the two links. I think Cisco will do it according to the bottom bit of an XOR of the source and destination MAC addresses. How your server distributes its traffic could be anyone's guess. It doesn't matter, it all gets picked up on the other side of the link as if it all came from a single link.
Kevin Dorrell
Luxembourg