Three things I've learned:
- Including file extensions within your file name is NOT redundant. In fact, it helps make life easier. For example, "Customer Pricing - PDF.pdf" and "Dealer Pricing - Excel File.xls" are good nomenclature.
- Your most important files should ALWAYS begin with the number '1', or a series of 1s. For added emphasis, add urgent-sounding words after the numerals.

- For desktop folders that you will only use, its OK to get a little personal sometimes.