Wikipedia.Can't say enough good about it.It could be said thatI rely too much on Wikipedia,but overall it ranks as one of the better sources.There are a tremendous amountof books that I have also referenced,but for general history,it is rare that Wikipedia does not have an equally goodwriteup.It is very much worth donating to - it's a tremendous resource.
Leroux & Compagnie - A site on the Leroux family
The Lalonde's are a big part of the Leroux family line, and includes some interesting people (Newsy Lalonde!). There is a great Lalonde family history here.
Programme de recherche en démographie historique, a program from the Université de Montréal. Background on the program is here, and the list of Filles du Roi that I've been using as a master list is here.
La Société des Filles du roi et soldats du Carignan. Includes a version of the list of the Filles du Roi
Historica Canada page
Nims Family - Not in our bloodline, but related via marriage in the Lalonde family
FamilySearch.org - Family history sponsored by the Church of Latter Day Saints.
Genealogy of Canada - Generally well researched (ties to PRDH/Drouin). Particularily strong for French Canadian ancestry