hey crabby, right on the first guess... normally, i would move this to mystery
plants, but since we already know what it is, i am going to leave it and give the necessary info to repot and care for it.
ok crissy, here is what you do...
to re pot it, you have 2 options,
1 - very gently pry the
plant loose from each place where it is stuck in the sponge board and then repot it, or...
2 - (this is what i would do) remove the entire root ball, sponge board and all, and repot the whole thing. then, just add a metal or woold trellis to it or better yet, put it in a hanging basket.
beyond that, it looks like you are caring for it perfectly, so i wouldn't change a thing!
by the way, pothos will grow just like that, and is often planted just like that. there is a plain green variety, and i have learned that pothos are in the philodendron family. the main difference between the two is the thickness of the stems and leaves.
also, don't let it near a wall that you don't want it to grow to, because they can and will attach themselves to wall paper and/or drywall. just fyi