Joan Goodchild has put together an article entitled "Social Engineering: Eight Common Tactics" for CSO Online. Knowing some of these tricks, and integrating tips such as these into regular employee training, can help ward off some of the threats to data security. Several of the tactics regard employees unwittingly giving information to criminals via the phone, while others are more traditional cybercrime issues.
"Social engineering is the art of manipulating people into performing actions or divulging confidential information... The term typically applies to trickery for information gathering or computer system access and in most cases the attacker never comes face-to-face with the victim." - Wikipedia
You can read the full details here. You can also read the latest McAfee Security Journal report about the increase in use of social engineering techniques in cybercrime.
Also of interest, ScanSafe has released the 3rd quarter results of their Global Threat Report. [PDF]