You forgot A Tribe Called Quest :P Modern R&B and hip-hop/rap is nothing like its progenitors, and in my opinion R&B means 60s/70s R&B, and hip-hop/rap means late 80s-mid 90s hip-hop/rap.
There is some good modern stuff. Fort Minor was just a one-shot by Mike Shinoda but really shows the influence of 90s classic rap/hip-hop; and "One A.M." by Diverse is an excellent hip-hop/breakbeat album. Eminem as a rapper was phenomenally skilled ("Lose Yourself" and "Without Me" are the only songs of his I can listen to), but wasted most of it on the crap that is what much of current "hip-hop" has mutated into. Lupe Fiasco is an interesting mix of new sounds, and old lyrics; I think he's the only active, high-profile mainstream hip-hop artist/rapper who's really doing things right. Most of the other good stuff has been pushed underground by the record labels, but the internet is helping to remedy that.