Thought these might interest a few people. I have used these before, or would potentially reccomend some to people.
http://www.onlineconversion.com
Great for working out your weights and measures.
http://caloriecount.about.com
Good for counting calories.
http://nutritiondata.com
Prefer the previous one, but good one all the same.
http://exrx.net
Good for descriptions and pictures of differing exercises.
http://netfit.co.uk
Similar to exrx.
On a slightly different note.
http://oanda.com
Only tried it once, as I've no real need to use it, but it's good for converting currencies, as it's updated almost every day.
