For me, National Geographic…well, they rock. I might not be objective or maybe it´s not as good as it seems (huge organizations are always suspicious). But anyway, they are. The best travel-writing, the best, scientific, accurate approach to life, people and cultures. The best pictures EVER, always.
They have an International Photography contest going on that anyone can join. And they have published some tips. Should you need any inspiration, you´ll find lots thru those links.