So what domains names are everyone rushing out to register?
A few years ago, I fell into the trap of domain-name speculation. It can get expensive in a hurry. Basically outfits like GoDaddy sucker you into thinking that you can make lots of money at it, but they're the ones making the money.
When I wanted to start a business, it turns out that someone had already registered "my" domain names - and were either sitting on them or offering to sell them to me for $K's. So I went with my 3rd or 4th choice for a business name instead.
I still keep a couple of dozen domains parked. Some of them are related to business ideas that I've had but not acted on. Meanwhile, I've eventually managed to get hold of a couple of domain names for my original business-name choice from 20 years ago. But now I don't know that I want to go through the hassle of a name change after all these years.