Tip for free money and influence
from
Stardock Forums
Something I've noticed is that when I'm allied with someone who I can't get to end a conflict with another civ's ally is that, if my diplomacy is high enough, I can get some goodies (cash or influence - sometimes even tech) for repeatedly making peace treaties. Basically every time they make an agressive action, I can ding em for credits. I'm not sure if this is a bug or not, but it's pretty handy to be able to take all your enemies cash and influence if you can't stop them from attacking.
~SDC~
~SDC~