Review BP's 2009 annual report. What intangible assets does the BP (British petroleum corp) hold? How are the costs of these assets managed over time (e.g., amortized, written-down) What percentage of total assets do these intangibles represent? What information can be gained from the various financial statements and the related notes in the company's annual report?

The report can be found by simply googling "BP's 2009 annual report."