Chris, when a computer is not functioning, the first step is to remove all extraneous parts that are cluttering the big picture and see if anything changes with those parts removed. First, I would make sure your AC adapter is functional with another computer...until you have seen it working, you don't have a known-good AC adapter. Next, I'd take off the lower casing, remove the hard drive, disconnect the battery, and remove one of the memory modules (as well as test the RAM slots as Dan suggested above). Take note of any dust, and blow it out with a can of compressed air, since dust conducts electricity and can be responsible for your system getting "zapped". See if you get a light on the AC at this point. If not, I would let the computer sit overnight with both AC and battery disconnected, because sometimes a laptop will take on a "bad charge", and it will not work again until this charge is allowed to dissipate. Also, repeat the RAM slot test occasionally.
If you do finally get a light on the AC adapter but the laptop won't power on, the next step is to try to jump the logic board by bridging the power-on pads with a metal object. This is because the power button/keyboard assembly in unibodies is problematic and very susceptible to liquid damage, and therefore it's necessary to try powering on the board without it. Often the board is good, and the laptop is simply not capable of powering itself on because the power button's connection to the logic board has gotten fried.