Oral presentation skills are essential in many occupations and settings. The following links will help you to develop your ability to deliver good oration, powerpoint presentations, or poster presentations.
A guide for improving your presentation skills.
Tips for public speaking and information on various courses in this area.
From PresentationZen.com; tips on creating effective powerpoint slides.
From PresentationZen.com; criticisms of Powerpoint and discusses its overuse.