One of the critical elements of blogging for profit is keeping up with Google and that is no small task.  Google loves to tweak their search engine algorithm and throw the marketing world in a tail spin.  That is why I depend on the folks at Noble Samurai and use their Market Samurai application for doing keyword research.  Brent and the guys at Noble Samurai stay on top of the changes that come out of Google headquarters and are ready to update Market Samurai as soon as the dust settles.