Bad Link Exchange Emails

Received the following reciprocal link spam today:

I would like to propose a link exchange between our sites...
Our Sites Details as follow

• Google Page Rank: 0
  
• Google indexed Pages: 882
  
• Back links: 0
  
• Yahoo Paid Directory Listing (No)
  
• Dmoz listing (No)
  

Life Without Toolbar PageRank

Available metrics are enough to make a fairly accurate judgement about the quality of a link.

• How old is the site?
• How often is new content added?
• How many backlinks does it have?
• How many of the major backlinks are controlled by the site owner or their associates?
• Is the site part of a link selling network?
• Does the site openly advertise link selling?
• Does the site state that buying links will increase your rankings?
• Does the site have the word or variants of SEO in it (even though unrelated)?
• (Yahoo) linkdomain: example.com SEO (If site gets many results, that's bad)
• (Yahoo) example.com SEO (a shorthand search for sites possibly in bad neighborhoods)