Ah, the holidays, the hardest time of year for those of us over-thinking--or clueless--gift givers.  I never know what to give people.  The travel industry loves inventing trinkets and gadgets that many times just break or prove useless and attractive to thieves.  After years of traveling by backpack through the developing world, I'm always looking out for useful, cool gear for my next trip.   So for those of you feeling clueless as to what to give the adventure traveler in your life, I give you my 2011 Holiday Gift Guide.  Everything here is designe