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Essential reading

Every study that has looked for errors has found them in considerable numbers. Spreadsheeting's childhood is over.
Good spreadsheets are essential for informing decision making. But most spreadsheets are not good. We help you make better spreadsheets.
"Oh My God" my formulas are not working! This article covers most of the reasons for Excel formulas not working. And how to fix them.
Research concludes unanimously that spreadsheet errors are both common and non-trivial. We must seek ways to reduce spreadsheet errors.
We are conscious of very few of our errors. When people are confronted with their actual error rates, they are typically shocked.
Overconfidence is one of the main causes of spreadsheet errors. Being informed about overconfidence leads to more accurate spreadsheets.
95% of all spreadsheets contain errors. So, it is almost certain that your spreadsheets are wrong.
Once information is loaded into a spreadsheet, it acquires properties that it may not deserve – a process called reification.