The currency itself is not anonymous. In fact it's a huge mistake to suggest such a thing. That would be like saying keeping a ledger at a currency trade makes the currency 'anonymous'.

Since there are more avenues of trade available than say, with cash, laundering and other clever tactics can be used as tools to cover your tracks.

As always, the only way to keep yourself safe is through GOOD OPSEC. Bitcoin is an evolution of the currency concept, a tool for moving and representing wealth; nothing more.