I was reading yesterday's featured post and got to thinking about my own situation. I was thinking about using my primary keyword in the domain name but it's not great for a permanent business domain to advertise.

As such, we are considering using the keyword domain name as the primary domain with a vanity domain that we can use in advertising (we would use a 301 redirect).

What do you think about this practice? Worth it or no? Am I giving myself an identity problem if I do this? Will I be confusing visitors that end up at a different domain than the one advertised?