Exhibit 99.2

HGS CALCULATION OF NET CASH BURN

Our July 30, 2008 press release announcing second quarter 2008 financial results includes a discussion of net cash burn, which is a non-GAAP financial measure. This non-GAAP measure may be considered in addition to results prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”), but should not be considered a substitute for, or superior to, GAAP results. We believe that net cash burn is relevant and useful information for the Company and our investors as it provides a simple method of determining net cash used by the Company. A calculation of net cash burn is provided below:

	Six months ended
	June 30, 2008
	(dollars in thousands)
Net income (loss)	$	(121,106	)
Stock-based compensation expense		9,304
Depreciation and amortization		10,402
Change in deferred revenues		(22,610	)
Capital expenditures		(3,951	)
Proceeds from sale of long-term investment, net of gain of $32,518		14,818
Net Cash Burn	$	(113,143	)