Hey
Dont pay attention to those shity bastards that team up against you. If they do, know that you're strong enough to kick them back to Palookaville...
These pacts can also be useful:
1) if the Great Library isnt obsolete, and you have it, usually when civ1 gets and advance, they share it with their ally civ2, and thus YOU aquire it.
2) same after Great Library - if civ1 has the tech, usually civ2 will as well, so you can to steal it from which ever one is closer to you.
3) if you wanna pick a fight with civ1, but the senate get screwfull and says no way, just pick a fight with civ2, and civ1 will have to join in the fun.
Be warned, however: a war on two fronts has never been a good outcome for anyone anywhere.
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"Anyone can win, unless there happens to be another entry."
- George Ade