I've just thought to mention a few. I've had my babies 10 years apart and there are a few new products around now I don't see the point of.
Nasal aspirators - just weird and unnecessary - newborns don't need you to suck their snot out as they will deal with it quite well themselves by repeated sneezing, which is ridiculously cute as well as being probably healthier for them than a plastic tube. I don't think it's very healthy to try to remove all mucus from the nasal cavity, it serves a purpose and you should probably leave it alone. When they get stuffed up with a cold, a squirt of breastmilk or saline spray from the pharmacy does a good enough job to loosen it which helps them be more comfortable.
Buggies which convert to a double - This is madness, it won't save you any money, as you can't guarantee you'll get pregnant right on the timescale you thought plus 90% of the time you pick the wrong pram when you're choosing blind before you have the baby - it's much much easier to know what you want once you've spent a decent amount of time actually pram wrangling, and unfortunately you can't really rely on reviews because people have such different preferences and needs. It's better to pick a pram which you think will work for the one baby you have right now (or twins if you're having twins) and worry about the sibling scenario later.
On a similar line - car seats which claim to do birth to 12 years, and car seats which share a base between infant and toddler seats. Especially 100% never get one if you're planning to have a second baby within 4 years. You're MUCH better off getting either a basic infant seat (Joie) or a good deal on one which comes with a travel system, base or no base depending on your need, and then put all of your money/energy/time into researching the stage 2 seat. The later you wait to get a seat, the more (safer) options you have on the market at cheaper prices. Plus, if you buy a seat which shares a base with the next stage seat you're just basically placing your pre-order for that seat and the company has a captive market in you. Most stage 2 seats don't even need a separate base, and if you have a DC2, they'll need the base for the baby seat anyway. There are other reasons this is a bad idea, but it's a rant which goes on for too long.
Weird pillow type things which are meant to be magic sleep inducers - poddlepod, snugglenest, whatever they are, these look like absolute death traps to me, especially the home made/cheap knock off versions which inevitably come around when the official things are so overpriced. I know many would fight me to the death on this one, though :o But I'm a fan of co-sleeping and I know not everyone is, so there is that. I have found the approaches in the newer (newborn) version of the no cry sleep solution to be useful in encouraging newborns to do at least some of their sleeping not on you though, (and not in a pillowy thing) so that's another option to try, if co-sleeping isn't your thing.