We just finished a re-roofing project where we installed the Lomanco Deck-Air low-profile intake venting system and it is as good as advertised!  The product is similar in nature to ridge venting, where the majority of the vent is covered by the shingles.  This leaves very little exposed and allows for a more stream-lined appearance compared to traditional roof ventilation.  When combined with an upgraded shingle like the GAF Grand Sequoia which was used in this example below you are left with a minimalist installation.