If you have Minnesota ancestors, this is a site you have to look at.
Eighty-seven Minnesota counties are participating in this project to make the location of state marriage records easy to locate. This is an index, do the images of the records themselves. But the beauty of the site is that you can search pretty much the whole state from one place rather than having to search county by county.
You search by Name (bride, groom, or both) and date range. The index identifies which county is the official custodian of the record. Questions and concerns about specific records should be directed to the custodial county, of course. Click on the named custodial county to be redirected to the county website for contact information.
Check it out at: http://www.mncounty.com/