Find Items And Datediff From Current Date And Print

What I want to do is I have a table checks which looks like-:

Items--Waitarea--Datecreated
1-------A1-------2011-10-12
1-------A1-------2011-10-13
1-------A1-------2011-10-14
1-------A1-------2011-10-15
1-------A2-------2011-10-16
1-------A2-------2011-10-18
2-------A2-------2011-10-19
2-------A2-------2011-11-17
2-------A2-------2011-12-17
3-------A2-------2012-01-17
3-------A2-------2012-01-18
3-------A3-------2012-01-19
3-------A1-------2012-01-20
4-------A2-------2012-01-21
4-------A2-------2012-01-22
4-------A2-------2012-01-31

What i need to find is items and datediff from current date to created date with respect to wait area. You will get more clear with example

For Eg. For items 1 the wait area changes from A1 to A2 at
2011-10-16 and remains A2 so i need to find the date differeence from
today date to 2011-10-16

For item 2 that wait area remains same for entire period that is
A2 so datediff from today date to 2011-10-19(last created date of that item)

For item 3 that wait area A2 then it becomes A3 then becomes A1
so need datediff from today to 2012-01-20

For item 4 that wait area A2 remains for the entire period
so need datediff from today-2012-01-21

The expected output wanted
items---daycount
1-----datediff(day,checks.datecreated,getdate()--here checks.datecreated will be 2011-10-16
2-----datediff(day,checks.datecreated,getdate()--here checks.datecreated will be 2011-10-19
3-----datediff(day,checks.datecreated,getdate()--here checks.datecreated will be 2012-01-20
4-----datediff(day,checks.datecreated,getdate()--here checks.datecreated will be 2012-01-21