The first graph shows sea ice extent – this is the amount of surface area that is covered by ice. As you can see 2007 was the previous worst year on record – but 2012 is beating that record.
The 2nd graph shows sea ice volume – this is more important than surface area - but tracks the total amount of ice left unmelted.
The 3rd graph shows sea ice extent over the past 110 years.
The 4th graph shows sea ice volume since the 1970s and projects where we are headed.
This site has many graphs showing what is happening with Arctic sea ice.