What are the tax changes I need to know about when filing my individual return for 2012?

I am doing freelancing for two different companies and I have several questions. I deliver for them digital files, such as research, PowerPoints or excel files. Do I need to add sales tax to the invoices? When and how do I file taxes? I have never worked before in California and just started working in October last year.

I am a Nonresident Alien and I live in Ensenada Baja California Mexico. I’m about to buy many electronics. Total value would be around $12,000 for my personal use. I am building my own house and I want to buy from SEARS in Chula Vista, California, but I don’t want to pay double tax (in the US and Mexico) since I am going to import the merchandise to Mexico. Is there any way to avoid the payment of taxes in Chula Vista?

Is a credit card statement considered a viable replacement of a receipt for income tax documentation of expenses or are credit card slips still required?

What is the difference between the gross and net interest rate?

What are the some available defenses against product liability claims?

What is a Future Delphi credit scoring and how does it work?

How many people actually go in for a Health Insurance? It is observed that most people think it is a waste of money so avoid it. What do you think?