thanks Loup, i meant when your treasury hits those milestones, your income will drop. I believe there's another drop again later, but I don't know at what treasury amount that it is at.
Lowering Maintenance: Efficieny, efficiency, efficiency. Really, in any game in any version of GCII (DL, DA, or TA) its always "The Economy, stupid!" From day one that should always be your priority, because if you can get that to flow, everything else will fall into place.
Some things you can do:
Prioritize your worlds: Instead of having a bunch of worlds that give you a lil bit of production, a bit of research, and aren't very good at either: specialize your planets. As a general rule, for every one Production planet you need about 3 worlds that are solely for economic use, since Research is more expensive, you generally need 4 planets per One Research world.
Make an Efficieint fleet, not a numerous fleet: Prioritize your research in a way that your warships will last long and be actually useful for you. Defense and HP are of particular importance, as a strong defense can render your ships nearly unstoppable for long periods of time.
Trade!: Use that diplomacy screen for more than just the "Howdy, Greetings"
Grab techs from other races that you don't have that can improve your economic ability, either through passive (flat percentage increases) or by giving you structures that have lower or even no maintenance costs. Same goes for factories and research centers. TA strategy should always include a hefty dose of tech trading.
As for screenshots, I believe in TA, while you are in a game, you just have to hit "Prt Scr" and it will take a picture and save it to the "My Games/Twilight/Screenshots"; from there you'll need to upload it to a file host, such as imageshack or photobucket