The slew of collaborative hip-hop releases this week is surely one the best in a long while. On one hand, you have the New York meets Jamaica via Africa eclecticism of Nas and Damian Marley's 'Distant Relatives.' On the other, Talib Kweli and Hi-Tek (under their Reflection Eternal moniker) have returned to drop 'Revolutions Per Minute,' a great mixture of soul, jazz and funk beats with Kweli going