Internet marketing metrics: what should be tracked

What should be mesured :

• Conversions: a visitor is great, a client is better;
• Spend: are you paying to much to have convertions?
• Attention: visitors, return visits, page views, and time on site;
  
• Bounce Rate: landing and leaving;
  
• Errors: is everything working properly?
  
• Onsite search terms: focusing on the right subject;
  
• Bailout rates: where's the leaving door?
  

http://www.conversationmarketing.com/2007/09/7_internet_marketing_metrics_y.htm