J.,
Congrats on the upcoming twins! =) As a twin mommy, you'll get the comment of, "it must be so hard having kids the same age". It's the only thing I know, so I think it's easier since I don't have to entertain an older kid. So, enjoy it. The other annoyingly dumb question is, "Are they twins?"
Anywho, in regards to your question about products, I think you're on the right track. Some items I found super helpful are bouncy seats, especially the ones that vibrate because it lulls them to sleep. Swings are a great thing, too. I got a Superyard or a Play Yard (I think that's what it's called). It's a white gated play area that you just open up for them to play in & not wander off once they get moving. Once they're older....crib tents!!! Those are a must have....they can be like $60 each, but look on raiglst for deals. One last thing that I found super helpful were Swaddles. Some people are great at swaddling with a blanket, but I could never master that. I purchased Swaddles, which are little coccoon things with velcro tags to keep them nice & snug. For the most part, I found that it kept them from rolling around. However, my son was a big roller. He sometimes preferred to keep his arms out of the Swaddle. You don't need burp cloths. What I did was get a 12 pack of cheap kitchen towels at Walmart. My kids are now 3years old & I still use the towels in the kitchen...you can't do that with a burp cloth. =) Oh, the last thing I can think of is crib wedges...they elevate the head of the mattress, which helps if your twinkies end up w/ reflux.
Look in your area for a Twins Club. I live in Rochester, NY, but I do know there are national chapters. We're having a sale this weekend where you can get clothes, toys, etc. It's a great network for women to get help during the tough times of parenting & just getting through life in general. Plus, Mamasource has been a great support network to me.
Word of advice, it is hard at first, as I would imagine it would be with just one child. Seek help from your parents, friends, etc. Maybe they could help make dinners, etc. It is tough in the beginning because babies are so needy. But, it does get easier as they get older. As I mentioned, mine are 3years old now. My son is an attention seeker (a wild child) & my daughter is chilled out. Patience is a good trait to work on because it is trying. You'll be super tired, but it gets better, especially with the help of some Pepsi Maxx (skip that if you'll be breast feeding). If you do breast feed, a pump would be a good idea! I did it for two weeks, but was too exausted...my daughter had to stay in hospital due to a staph infection she contracted during her stay in the NICU.
I wish you the best in the remainder of your pregnancy & all the fun afterwards. It can be "double trouble", but I like to say, "it's double love". =)
If you want any more advice, I would be glad to be part of your support system. I'm no expert, but it's good to speak with other twin moms, especially when all your friends don't have multiples.
Best wishes,
A. Ski