HI Romilly,
Thx Shellyesq, it appears the link you gave will be helpful. I am currently focused on finding birth records for my 3rdG-grandfather Orrin, bn 1796 in Ashford and his father Smith Holt, bn in Hartford Conneticut. I have Smith's marriage info from the Barbour Collection transcription as well as Orrin's marriage (church record transcription) and death information from the Ontario Ontario Vital Statistics Agency and newspaper obit. The thing missing is the birth records :-( I did contact the Ashford CT municipal office for Orrin's birth record, but no luck there.
I too live not too far from Wisconsin, albeit a Canadian neighbour. You may want to contact a RAOGK volunteer at
http://www.raogk.org/ who lives in the area being searched to do some work for you. There seem to be quite a few volunteers in Wisconsin. Most do the work for free but some of them do charge for photocopying and the like so you will need to ask ahead of time.
Hope this helps,
JDC