San Diego’s RoyaltyShare , the firm which tracks digital royalties for record labels,  is also part of that deal. Economy-relate layoffs continue to pile up: Oversee.net said it will lay off 18 percent of its staff, as the firm sees a “Very difficult economic environment” in 2009. Here’s our weekly roundup of recent Southern California technology news: More music moves at MySpace , with a new deal to distribute music from independents.