The Oxford based Centre for Evidence Based Medicine have made a wide selection of powerpoints available from their website.
Titles include:

• Introduction to EBM – Paul Glasziou
• RCT Appraisal – Dan Lasserson
• Systematic Reviews – Paul Glasziou

Did you know that CEBM also have a YouTube channel?

This is just one example of the content:
“A Clinical Introduction to a Pre-Clinical Course in Biostatistics” which features Professor David Sackett teaching first-year medical students