Conference proceedings and talks on a CV?
There is a little bit of variation depending upon the discipline, but generally the convention is along the lines of the following:


  CONFERENCE PROCEEDINGS
  
  Invited Talks
  
  Unsolicited presentations (ex. keynotes) where you are invited by the organizers.
  
  Papers
  
  Complete manuscripts that are published in proceedings and indexed by relevant databases.
  
  Abstracts
  
  Short (i.e., 250 words) or possibly extended abstracts intended to describe the talk.
  
  Posters
  
  Any poster presentations, these may be eliminated by senior scholars.


Generally the rule of thumb is that the section is organized by most prestigious (i.e., invited talks) to least prestigious (i.e., posters). When applying for an academic position this section should be as complete as possible as well. Additionally, it may include notation indicating you are the presenter if you are not the first author.