The US switched from First-to-invent to First-to-File starting March 16, 2013.
This website is about 5-10 years too late.
Just replying to try to mod this up a notch (my postings seem to come in at 2, and I don't have moderator points today).
This needs to be emphasized: Prior art doesn't mean what it used to mean as of 2013 as said above. This further tilts in the direction of large companies who can better afford to "carpet bomb" the patent office with filings.
Anyone who thinks the patent system has any resemblence to "fair" should try filing just one patent on their own, without legal representation. If you have a career history of filing patents (for instance, with an employer who wants you to do it, so pays for the process), you might learn enough to succeed individually. But even then I wonder.
Expect each and every one of your claims to be rejected when you file. It's standard practice, regardless of what the claims say. Expect to have to "plead" (respectfully of course) that the patent examiner reconsider these rejections. Expect to need to cite precedence from prior patent proceedings and case law to support your "plea".