Christians have generally believed for 2000 years that Christ will return to judge the earth at some point (e.g., Heb. 9:28). Of course I do not think that an informed biblical theology will include a seven year tribulation or a rapture that is somehow separated from the judgment in time. Indeed, it seems likely to me that in 1 Thessalonians 4 believers meet Jesus in the air only to return to the earth for the judgment.
Unless Harold Camping is the greatest prophet since John the Revelator, I doubt very seriously there will be a rapture today. I will continue grading. He has no clue how to read the Bible in context, and he falls into a predictable pattern. On Sunday he will either recalculate or say the rapture happened in some spiritual way. It's all been done before... many times... especially in America.
And once again, people will associate Christianity with stupidity. Christianity will take another knock this week. Those with the signs this week, they should be silent for a while. They should take stock, realizing that they have made God look bad... again.