Do everything possible the night before. We have our main meal at midday, so I will cook it up the night before & just reheat it next day.
I have a DVD (one of those Baby Einstein ones) in the machine at all times, plus loads of DD1s favourite shows (the ones which don't drive me mad) saved on the hard drive ready to keep her occupied when needed.
A bouncy chair upstairs & downstairs so there's always somewhere to put DD2
Getting DD1 to "help" as much as possible, getting nappies/bum wipes/baby clothes for me (they are all within easy reach, but she loves to "help"!)
Try to get outside at least once a day, even if it's just to kick a ball around the garden or to walk round to the shops to buy some stickers!
Keep DC1s routine the same as much as possible. I do worry sometimes that poor DD2 has to fit in with what DD1 is doing, but I figure it's better for all of us to keep DD1 "sweet" about having a baby sister!
Find a toddler class you can take the baby to. DD1 & i do a music & singing thing, which DD2 watches from her car seat. The lady who runs it inky starts charging fir the second DC once they're out if the car seat!
Have lots of chocolate on standby in the fridge. DH says he can tell what kind of day I've had by how much chocolate I've eaten!