The symptoms you describe sound like a Body Control Module (BCM) issue.
First, with the key out of the ignition (to prevent further problems!), disconnect the NEGATIVE battery cable.
Next, disconnect the power to all the new electronics you added. Whether it is pulling out the fuse, removing the wire, whatever, disconnect the power completely. Note that turning off the power switch is not the same as disconnecting the power.
Now, reconnect the battery, and see if the car acts normally. If it does not, it's possible that you have a damaged BCM. But, it's also possible that you have a bad or discharged battery, especially if you left the doors open for a while while you were connecting all those electronics.
If the car does act normally, turn the key off. Reconnect one of the new devices at a time. If you pulled a fuse, just reinsert the fuse. If you disconnected a wire, it is probably safest to disconnect the battery again (always the NEGATIVE terminal) before reconnecting the wire. Note that when disconnecting the battery, you should leave it disconnected for at least 30 seconds before reconnecting it; this allows the electronic devices in the car to reset properly after having their power removed and then reconnected.
If the car starts acting funny after reconnecting one of the devices, you've found a problem. You should make sure to check all the remaining devices just to make sure there's not more than one.
Note on Blackhawk131's suggestion to try swapping modules from a junkyard: Don't. The modules cannot be swapped without being reprogrammed by the dealer, and they very likely would not touch a car with a used BCM installed - not that you could get it there without towing it in. Used modules are most certainly not plug and play (more like plug and pray, and your prayers will not be answered!).
Last edited by MattInSoCal; 10-31-2010 at 04:06 PM.