Nielsen Business Media is laying off between 40-50 staffers, reports PaidContent and Folio. The layoffs hit the editorial departments of Adweek, Brandweek, Mediaweek, Editor & Publisher and the Hollywood Reporter. Nielsen reported overall revenues of $4.7 billion in 2007, an increase of about seven percent over the previous year. The company’s total debt, however, was $8.25 billion on December 31, with cash balances of $399 million. This also comes after Adweek has scaled back on issues.