Go read Narbonic. Kiss your free time goodbye for the next week.
My favorite web comic, Narbonic, just went from paid to free archives today. Unfortunatley, navigation on the new site is still somewhere between 'rough' and 'impossible.'
Over the five-year run of the strip thus far, creator Shaenon Garrity's art has progressed from lousy to decent, but her intricate plotting and character-driven comedy started out strong and just got better.
If you're willing to take my word that it rocks, you can start at the beginning. If you'd rather risk a few spoilers to see it at its best first, try Professor Madblood and the Doppelganger Gambit, the plotline that promoted me from an occasional reader to an active fan.