This excerpt taken from the RVBD 8-K filed Apr 24, 2008.
GAAP to Non-GAAP Reconciliation:
Excluded amount represents stock-based compensation expense. Stock-based compensation is a non-cash expense accounted for in accordance with the intrinsic value method under Accounting Principles Board No. 25 through December 31, 2005, and with the fair value recognition provisions of Statement of Financial Accounting Standards No. 123(R) effective January 1, 2006. While a large component of our expense, we believe investors want to exclude the effects of stock-based compensation expense in order to compare our financial performance with that of other companies and between time periods.
Riverbed Technology, Inc.