E.S.
I've been a stay at home mom for five years now and know how hard it is to feel like you have any kind of order for a prolonged period of time while you're at home...things just fluctuate so often at home and stuff gets in the way! I've realized that I have to readjust my schedule every so often to encompass the next "at home" stage of life for me and my kids.
Working during naptime is a good idea and if you have more work to do during awake-time, then I'd suggest an educational dvd on the tv...with a little work you can find one he/she really likes that's not too stimulating. I know you want to be careful about tv time, but if you use it in moderation it could really be helpful for you!
Also, if your schedule allows, maybe you could have your husband watch the baby a couple nights a week so you could catch up with work where you're behind...or perhaps pay someone a couple days a week to come entertain the baby while you're working for half a day or something...
Just some ideas!