Hi everyone
Recently I played a game on a small map and wanted to aid the Altarians against the Drengin.
In the diplomacy window I traded all of my combat ships to the Altarians (I had recently made peace with the Drengin). To my surprise I still had control over the ships.

I waited a turn and still had control. I think I know why
I had placed a transport in each fleet of combat ships and I hadn't traded them away.
So, in conclusion: To get Tech's and other stuff from your enemy place some valuable ships in fleets with other ships and then trade them away to someone. Wait to next turn and do it again!
Be fast because Stardock is sure to catch this one
On another note I experienced something cool: I had lined a lot of ships up around some of the Altarian's planets ready to exterminate them and suddenly I get a message from them saying that they know what I am doing, but can't do anything about it because they weren't "intelligent" or smarter

How cool is that!