My list of "Do's/Don'ts" for Pregnancy:

DO:

• Invest in some type of body pillow. You will DEFINITELY need it for either going between your legs while sleeping, or as I did, run it the whole length of your left side. You won't be able to sleep on any other side or your back as the pregnancy goes on, so get used to the left side early. And it really helps with the body pillow.
• Get to know CROCS. And by CROCS, I mean the absolutely wonderful and not so pretty rubber shoes that were such the craze years ago. You will find that they are awesome not only for helping you walk around the house when you get as big as the house, but you can slip them on and off without having to bend down. I recommend having a pair or two to wear out of the house and one pair to wear in the house.
• Buy maternity clothes - I know, everyone complains about them endlessly, but I found they were a dream come true. I'm even still wearing some of them! I did find that the most reasonable place to buy those clothes were Old Navy and Burlington Coat Factory. And let's discuss bras for a second while on the topic - go to Motherhood Maternity and purchase a couple of nursing bras - not the regular underwire ones, but the ones that look like doubled up sports bras. These things are the best thing since sliced bread, especially after giving birth, but they were so comfortable while being pregnant. I've now been wearing mine for about the last 5-6 months and they are still in excellent condition.
  
• Relish in your glow - you WILL have great skin and great hair as pregnancy goes on, especially in the last few months. That will all go out the window later on though, so enjoy it while you can!
• Buy quite a few sleep n' play outfits for your newborn. Don't bother with the cutesy little onesies or little sweatsuits or things of that nature. The sleep n' play outfits, especially the kind that zip all the way down are money in the bank. It makes it so much easier in the middle of the night when changing diapers or changing outfits in general (after spitting up, etc).
• Buy a Diaper Champ. And by Diaper Champ, I mean the one and only Diaper Champ. Not the Diaper Genie, but the Diaper Champ. Best invention ever and it holds A LOT of dirty diapers and you won't smell a thing. And, you don't have to buy the special replacement bags - it uses regular trash bags.
  
• Buy a pack of cloth diapers by Gerber. They make the best burp cloths because you can get them all the way under the baby's chin. They are super absorbent too.
• Stock up on bottles if bottle-feeding. My recommendation would be anywhere from 18-24 bottles, preferably the largest size available. We made the mistake of buying 6-7 oz bottles and that's getting ready to be extinct with how much he eats now. We wish we would've bought the 9 oz bottles from the start.
• Take the time to register on www.babycenter.com. I found this website much more informative than all of the books I bought combined. They send you weekly emails letting you know what to expect that week, what the baby looks like, etc. Awesome info!
• Also take the time to register on the formula websites. Especially if bottle-feeding. You will totally need those $5 off coupons. (also register your better half too - double the coupons)
• Buy a video monitor. If you have the money, buy one. It eliminates A LOT of treading to and from his room to check on him. We bought the Mobi video monitor from Walmart for under $100 and it was by far the best money we ever spent.
• Buy a "swaddler." I always thought the swaddling blankets were such a rip-off since you could just use a regular blanket. I'm now understanding that there is a reason for their existence. You can't find a blanket on the market that is big enough to swaddle correctly. We got so disgusted with trying to swaddle him in swaddling blankets that were so small, that we didn't do it for very long before we switched to a sleep bag. Buy a couple of those too - they are AWESOME as well. You just zip the baby right up and it's a blanket... you don't have to worry about it choking them.
• Prepare meals ahead of time. Cook and freeze as much as you can before the baby arrives. I bought a ton of meats and froze them in individual bags and thawed them as needed. Not to mention, spaghetti sauces, breads, chili, etc. All of that stuff freezes really well.
  

DON'T:

• Buy cases and cases and cases of newborn diapers. It's surprising how fast they grow - our baby was only in them for about a month or so and then graduated to the next size.
• Waste money on a bottle sterilizer. We didn't realize this, but our dishwasher has a sterilize setting on it. Automatically saved us $18!
• Waste money on the night/day bottle warmer either. You will get a little cooler in your diaper bag from the hospital that you can use for night bottles. Just purchase an extra bottle warmer, $19, and keep that in the nursery. We just take the cooler up at night before bedtime.