I'm in the same position. I don't remember when I harvested my pacman yeast, but I made a large starter from it and just stuck it in the fridge. Mainly this was due to a sulfurous odor that I was getting from the yeast so I didn't want to waste potentially 5 gallons of beer by using it.
Still, I can't bring myself to just throw it away,so there it sits, staring at me from the back of the fridge. I might end up using it to ferment a smaller 2.5-3 gallon batch and see how it does.
At any rate, what I was planning on doing was just adding some starter wort to it to wake it up a day or 2 before I pitched it; that way, the yeast would be ready to go and not sleepy from being in the fridge for so long.