I pulled the hard drive out and slapped it in my old T60, and it worked fine, so I used that for the rest of the day, then called Lenovo this morning, fully expecting that the mainboard would need to be replaced.
When I spoke to a Lenovo technician, she asked if I had dried it off, put it under a fan, and I replied that I had. Then, she asked me to do the following:
* Disconnect the power cord and remove the battery
* Press the power button ten times, and on the last one, hold it for 30 seconds.
* Reconnect the power cord and battery
When I did this, my system came back to life. That is officially the strangest repair I have ever seen, even stranger than the time I kicked a PC and brought it back to life.
Kudos to Lenovo, and whatever animal they sacrificed to accomplish this feat. :)