If you are managing a large number of links, it is important to understand the 
recent history of status codes returned from each URI. Temporary 404s, 403s, 
500s are quite common. So are DNS problems. The advice given by checklink 
to "Fix it Now" is sometimes wrong. It would be much better if the program 
could give advice like this: "This link has been consistently broken or 
unreliable for two weeks. Consider deleting it".

It would be great if checklink could write to and read from a status code 
cache -- but the ability to specify machine-readable output (so checklink users 
can manage their own cache) would be very helpful.