First: It is FALSE to say that as a corporation you can deduct more expenses.
WRONG ANSWER.
Second: C corp might not be as beneficial as S-corp. which gives you pass through taxation. (Under C corp, the corporation will be taxed and all payments to you will be taxed again, under S corp all the profit flows through to you and only you will be taxed).
Finally, in CA for example the Franchise Tax Board asks a minimum of 800 dollars per year for the privilege of doing business in CA. Just a cost to take into consideration.
For Blackhats it might be interesting to create one entity, have it tainted and then have it merge with a second entity (which has a new federal tax ID,
new address etc., these mergers do not cost a lot of money).
[Yes I am a lawyer, Yes I hate my job].
Personally, I currently make enough money to pay the maintenance of the corp. (meaning all income goes to the corp. and nothing left for me) since I am a little paranoid and do not like doing business under my own name.
Also if you want to sell your blog, site, whatever,you can sell the shares of your company and everything passes through to the acquirer (you don't have to transfer domains, need not get approval from the landlord, do not need approval from authors that you are assigning their copyrights..., don't have to ask adsense or clickbank, CJ ... no: everything stays in the company, only the shares change hand).
Regarding the research, I have used and recommend the NOLO press books.
On the one hand you do not want to become a lawyer/accountant, on the other hand you need
to know what is going on.
LLC is a little less formalistic (you do not have a board of directors etc. ) however, in California you cannot do certain things under an LLC like real estate, construction etc. (BTW LLC offers the same advantages as S-corporation, that is pass through taxation).
One word of caution: a corporation is basically an insurance against personal liability. That means you keep your bank accounts separately and do not commingle personal and business, otherwise you lose the corporate protection.