Coffee is one of the super-foods originating in Africa advocated by paleo-hacks. Ginger and garlic also.
Caffeine is only potentially harmful in combination with high blood sugar or high blood pressure, i.e. it is usually not a problem for someone eating primally who is not insulin resistant.
F 5 ft 3. HW: 196 lbs. Primal SW (May 2011): 182 lbs (42% BF)... W June '12: 160 lbs (29% BF) (UK size 12, US size 8). GW: ~24% BF - have ditched the scales til I fit into a pair of UK size 10 bootcut jeans. Currently aligning towards 'The Perfect Health Diet' having swapped some fat for potatoes.