This isn't in the book because it isn't something your average indie will worry about... however, it may be interesting for some of you readers out there to learn.
Trademarks and Tradenames do NOT protect your concept from large companies. Tradenames can protect your concept from small companies, about your size or smaller, but when a major corporation comes and steals your Tradename you are "Shit out of luck."
In the Kellog Creek Software incident, specifically, Hasbro infringed on KCS's Spirit Wars. The end result of the lawsuit nearly put KCS out of business, despite the fact they WON.
This is pretty common, and in talking with the owner he says the piece of advice he should have listened to was when another firm said the best thing to do when this case began was to write an appology letter to Hasbro and offer them (for free) the rights to his product.
Sounds crazy doesn it? Just keep in mind they have money and you don't. They have teams of lawyers and you don't. They play dirty as sin... and if you try to you'll be worse off for it.
So establish a copyright, trademark, and trade name, but do not think for a second it (or anything) you do makes you terribly safe from large corporations.
I've heard plenty of other horror stories like this, including a SECOND one from Hasbro.
Kudos to Kellogg Creek Software (www.kelloggcreek.com) for sticking to their guns and winning a settlement. Shame it couldnt amount to anywhere near the legal fees and lost time it caused.