I got to thinking while I was at work last night that if I went to work Friday night, I'd be working on things that were due after I was no longer employed there. That seemed pretty silly to me and something nagged at the back of my brain saying there would be some exposure of liability to the company if I did that. Probably just rationalization.
In any case, when all the work was done tonight (a bit later than expected thanks to a last-minute ASAP job) I turned in my card that opens the doors and the card I used to punch the time clock.
I am officially unemployed from now until 8:00 a.m. Tuesday morning. I couldn't be happier.