Can Bitcoin help people commit money laundering? I don't have enough knowledge pertaining to the Bitcoin mechanism. Can Bitcoin help people commit money laundering?
Since the vast majority of money launderers seem to prefer cash, I'd say the answer is no. At least, not yet. The way money laundering works is that you hide illegitimate transactions in a sea of legitimate transactions. There are a vast sea of legitimate cash transactions which makes money laundering in cash work well. Until there are some high-volume Bitcoin businesses, there will be nothing to hide illegitimate transactions with.

Even if the idea is to buy Bitcoins with dirty cash, sell them at an exchange, and claim you bought them really cheap and held them for a long time -- where can you buy large numbers of Bitcoins anonymously for cash?