What is As-Salafiyyah? - Allaamah Shaykh Ahmad bin Yahya an-Najmee (Translated) ~ Audio
A good concise description and summary of da'wah salafiyyah; the Shaykh shows how it is an obligation upon every individual to adhere to this manhaj. An excellent listen for anybody new to this blessed da'wah.

The Fundamentals and the Principles of Salafiyyah - Shaykh 'Ubayd al-Jaabiree (Translated) ~ Audio
A point by point explanation of the foundation principles concerning da'wah Salafiyyah. A must listen for every Salafi.