Good luck on the commute, set yourself some goals, get past the first day, first week then first month and I promise you won't look back.

I had to get back on my back after a long time off it, and have saved over £400 by not using car/bus. I feel fitter, am still slightly nervous when I have to join a highway (but its only for about 10% of my trip).

Panniers have certainly helped, I was sweating so much with a back pack, but now I give myself plenty of time, I take it easy and ensure I get about 15 mins the other end for my body cool down.

Good luck, post details of how you get on!

Puff