Traders
mtgox the big bitcoin trader
Bitcoin to other virtual currencies
BTC-E
Vicurex
Coins2coins calculator
Bitcoin charts and statistics
bitcoincharts
coinwarz exchange and difficulty rates
blockchain (Only Bitcoin)
clarkmoody
mcxnow - stopped but will be back
Virtual Currencies
Bitcoin BTC
Zerocoin Anonymous currency
Litecoin
Dogecoin
[1] Dogecoin powers Jamaican bobsled team
How bitcoin mining works:
a bit of info
Guides to building a machine:
Cryptobadger
Forbes
Coinminingrigs
What does difficulty mean:
Litecoin.info
How difficult are litecoins?:
Litecoinscout.com
Mining profit calculator:
Coinwarz mining calculator