These are some websites which are great for planning or general inspiration:

Breathe with me – A UK based project which aims to support the Cystic Fibrosis Trust

Alastair Humphreys – An adventurer, author and motivational speaker who cycled around the world.

That Emily Chappell – A cycle courier who is cycling around the world, blogging awesomely as she goes.

Ross Methven – City slicker turned passionate cyclist, this blog documents Ross’s trip from Edinburgh to Cape Town.

Great Big Scary World – Website of Jamie Bowlby-Whiting, an adventurer who thinks that anyone can have an adventure.

London Cyclist – Website run by a London bike enthusiast. Great for picking up tips and getting your cycle geek on.

Bored Panda – Randomness from around the world.