I don't know if this has already been flagged up but In the last few days Wolverhampton Archives have added a number of PDF indexes to their website. They include parish records from as early as 1538 to 1937 in some cases. There is also an index for Merridale Cemetery which is really interesting.
The link is:-
Family History Sources - Wolverhampton History
I have checked some of my research against the contents of the index and they seem very accurate. If anyone needs to check the records out, most parish records are held at Stafford records office as well as Wolverhampton.