I figured out this week that if I go in early every day and take a short lunch break, I could come home at noon on Fridays. Our Friday afternoon is usually just 3 hours long, and starting 30 minutes early every day makes 2.5 extra hours. Now, the main problem with this plan is that officially the company does not allow flexible working hours. Unofficially, as I understand it, just about every manager allows some flexibility. I haven't asked anyone about this possibility just yet.
Mokalus of Borg
PS - Another option is starting early to come home a bit early every day.
PPS - That would be easier to swallow for a manager, I think.