I haven't yet had a chance to note my latest two book chapters on produsage here - both in German, and following on from conferences in Germany which I spoke at in 2008 and 2009:
The reader Prosumer Revisited, from the Prosumer Revisited conference which I attended earlier this year, contains my chapter "Vom Prosumenten zum Produtzer", which argues that the 'prosumer' is no longer a useful term to describe the changes in participation and content creation which are occurring today, and provides a concise overview of produsage, or Produtzung, as an alternative. Probably a little more clearly than I did in my conference presentation itself!