Having reread your post, I take serious issue with the advice that you are giving on this forum. Note that the original poster may not be earning enough to make an LLC worth it, may not have an understanding of what it takes to handle an LLC taxwise, and you have no idea of what his tax picture looks like.
How can you so aggressively suggest that someone incorporate 'now, not next week, now' when you have no idea of their situation? You have the benefit of anonymity, but are you a CPA, tax expert, attorney, or otherwise qualified to make such strong conclusions? From your username, my guess is that you are in the business of incorporating which makes your posts even more suspect.
Further, telling someone that they 'may well owe NO tax' at the end of their tax year is ridiculous. What is the basis for that? Anything is possible, but is that a likely or even realistic scenario? You comment about the 'double taxation' stories makes no sense either. It's possible to elect s-corp status and pass-through, but that doesn't even apply to an LLC which would be taxed as a partnership unless otherwise elected. But, the concept of double taxation is alive and well - it just has no context here.
Finally, this whole sentence is mind-numbing and makes little sense: "You would of course owe tax on whatever personal income the corporation pays you but since the corporation is the the entity buying the required goods and services for the business, your personal income need not be all that high if you want to keep your personal taxes low. " What is your point? Everyone knows you can reduce personal income by buying stuff through an entity and deducting it, but unless you have a strategy that makes sense and you have actual, useful expenditures that you can take through the LLC you are not going to be successful reducing taxes unless you are also willing to trade your income for a lot of 'stuff' that you may or may not need.
People come to this forum for thoughtful advise and all of them are at difference levels of sophistication with regard to business and finance. It's important to keep that in mind when giving out important advice about legal/taxes - bad advice can really hurt people.