Definately go to car-seat.org to research car seat stuff. It's the best info out there, and you can do it relatively quickly and pain-free that way.
For cloth diapers, I agree 100% with Julia- you have to try them. Seriously. I've cd'd 3 kids, and different things worked at different stages, etc. Kids are built differently, too, and their build changes once they start crawling, then walking, and everything fits differently then. Buy a little of each thing you want to try, and wait till baby gets here and test drive it all.
For gear, we just bought one of everything (and I do mean everything
) with our first and then figured out what we used/loved/hated, etc. I'd definately recommend buying used or finding great sales- it sucks to buy a $100 swing that your baby hates (but for a baby who will only nap in a swing, it's worth 5x that amount) and the kicker is- you never know what your baby is going to like until they get here and you experiment! Being able to borrow stuff is great, too- if your baby loves it, you can buy your own, if he/she hates it, you can return it with no money wasted. And you can absolutely always buy after the baby is born; if all is going well and you don't have a bouncer seat, no need to buy one. If your baby has reflux or needs the vibration to relax, send your DH or friend to Target to pick one up if you have to. It's okay to put a bunch of stuff off.