Well, first let me say thank you all for the advice and encouragement (mostly). I have done it one direction now, and I will say that at least for now, one direction is all I can manage. But, the bus in, bike home is definately something I am going to continue, hopefully twice a week. Eventually, I may be able to add in a once a week ride both directions, but not fit enough yet.
Long commutes stink no matter how you get there.
This, I think, is the essence of my drive to do this. Now I just need to justify new tires. (The 41 raves about Conti GP4000S, but would y'all reccommend anything different (cheaper??) for communting? The roads aren't horrible, but it's definately not a debris-free route.