I have two boys, age almost three, and 9 months. We also use DVDs for this purpose, and if I'm alone with them at night that is definitely what I end up doing. I get them both ready for bed, let DS1 watch a DVD while I put DS2 to bed, and then read and put DS1 to bed. I don't like to use the TV as a babysitter, but it's not easy having two little ones and for now, that's what works.
For naps, my best strategy is to make use of a comfortable double stroller, and take them both for a walk around the block. My two take almost all their naps in the stroller. DS1 is at the point where he is starting to give up naps, and I could easily spend an hour battling with him if I tried to get him to sleep in his bed. With another LO around, I don't have time for that. So, the stroller is how we do it. DS1 falls asleep that way, and about half the time, DS2 will go down for a nap at the same time.
I do this regardless of the weather (barring blizzards and hailstorms of course)--today it was raining and I put the raincover on the stroller and my raingear on. Both the seats recline fully, and have lambskins in them to make them comfortable. In the winter, they have stroller sleeping bags-otherwise, we just use blankets. DS1 likes to have a light toddler pillow in there too. (Since he is almost three, I'm OK with that.) When we get home, I just remove the blankets and let them continue napping in the hallway.
The other advantage to having the stroller be their regular napping spot is that DS2 can be sleeping while I take DS1 to the playground or on other errands using public transportation. Also, if DS2 doesn't fall asleep during DS1s tnaptime, he gets some fresh air and a nice walk. So do I.
Of course, you would need a comfortable double stroller to do this, but that's my two cents.