Hi, can someone tell me about exchanges of crypto currency (btc+altcoins)? 
I prefer btc-e for both btc+altcoins sometimes Cryptsy or indacoin.If you are looking for btc exchanges in particular
follow the link below for reviews
https://bitcointalk.org/index.php?topic=695082.0
Please avoid keeping your bitcoins on exchanges or other online wallets.
The most usefull post. Thanks for that.