Best Bike and Running routes across the world

http://labs.strava.com/heatmap/#11/146.00164/-17.95905/yellow/bike

It makes 160 million rides and runs  look like art... beautiful 

MapCrunch: a random journey around the world... when you need to get out more

http://www.mapcrunch.com/

By clicking GO on the site it takes to to a random location on Earth and shows you the streetwiew... cool

Fantastic optical illusions just for fun

http://www.quora.com/What-are-some-great-optical-illusions#ans787944

one example:  A toll road bends up hill :-)

Ever wondered what Pinterest is...?

This is such a good way to find things that you will like...
https://about.pinterest.com/en-gb

Discover ideas for any projects or interests, hand-picked by people like you.

Working from home: but its too quiet and you wish you were in a trendy coffee shop

https://coffitivity.com/

Internet Speed Test - without all the adverts

This is a nice simple tool to find out how fast your connection is:
http://www.speedtest.btwholesale.com/

Here is a version WITH LOTS OF ADVERTS (choose Begin Test, the other things are adverts)
http://www.speedtest.net/

iPlayer Radio - everyone knows the iplayer for TV, the radio app is also great

There is a lot of world class programmes on iplayer for radio, especially useful are the one demand and podcast features.
- Listen live to all BBC Radio stations
- Browse hundreds of on-demand programmes
- Download podcasts to listen on the go

Here is the PC version
http://www.bbc.co.uk/radio

There is also a great app for iphone and ipad
https://itunes.apple.com/gb/app/iplayer-radio/id560458506?mt=8

Here is the android version:

https://play.google.com/store/apps/details?id=uk.co.bbc.android.iplayerradio&hl=en_GB

Anyone can draw something in 3D: Sketchup

Start by drawing lines and shapes. Push and pull surfaces to turn them into 3D forms. Stretch, copy, rotate and paint to make anything you like. If you want to be productive within a couple of hours, you’ve come to the right place.

Ready to start learning? Download free version http://www.sketchup.com/, then...

• ... watch a getting started video.
• ... learn about SketchUp's tools.
• ... ask a question in the SketchUp Forums.

Find a 3D model of anything

How hilly is it?

Find out how hilly it is between any point A and B

http://www.geocontext.org/publ/2010/04/profiler/en/

TED Talks - short talks by inspiring people

Ted talks:  learn something different today

http://www.ted.com/talks

Look at old maps of where you live

Search for your favourite places here:

http://maps.nls.uk/geo/explore/

Information is Beautiful

Helping you see what is going on with great visuals and infographics

A wide range of visualisations are here http://www.informationisbeautiful.net/

Is your password high up in this list?... if so then its time to change it
http://www.informationisbeautiful.net/visualizations/top-500-passwords-visualized/

I like this one:
http://www.informationisbeautiful.net/visualizations/rhetological-fallacies/ 

Your name over time

How popular is your name over time:

http://rhiever.github.io/name-age-calculator/index.html?Gender=F&Name=Janette/

Doing useful things with numbers

Worlfram Alpha

This does for numbers what Google Search does for text .
https://www.wolframalpha.com/