Virtual currencies

Traders

mtgox the big bitcoin trader

Bitcoin to other virtual currencies

BTC-E

Kraken

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

Use BTC in Las Vegas

pay for porn with BTC

Zerocoin Anonymous currency

Litecoin

Dogecoin

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

News

Coindesk

Regulation and crimes

Bitcoin US Senate Hearing

BitInstant CEO Charlie Shrem Arrested for Money Laundering

Bitcoins legality around the world

Russia bans bitcoin

Meetups and communities

Bitcoin Meetups in the Hague