Just to echo a few of the comments above from NWRA, we've had need to create multiple entities over the years for various business ventures. Wyoming truly does have a LOT to offer. In fact we may very well be using a Wyoming entity for a new venture in CdA.
That said, DO YOUR HOMEWORK. The venue of the corporation isn't the last word. If the State of Idaho determines you have a "nexus" (study that term) in Idaho, they're not just going to say "oh well" and go away. There is more to this than just filing. You really need to understand what is going on behind the scenes to make sure you're staying inside the rules. There is a big difference in tax avoidance (legal) and tax evasion (illegal.)
I'm not trying to scare you. As long as you learn the rules of the game, and structure everything correctly, trusts, corporations, LPs etc. can be very useful tools for wealth preservation. If I could offer one piece of advice though, it would be to spend the few dollars on the front end to make sure it's done right. If you don't know who the right person is, then an attorney who is board certified in that type of law would be a good place to start.
Good luck.
