I had to check mine, but 3 to 3-1/2 qt. is about standard size. Being single, the one I use the most is a 1-1/2 qt. Rival, and I simply cut in half most recipes.
All of the recipes I've found fit my 3 qt. just fine, but many of them also state what size crock pot they are written for.
As for recipes... For my taste, I haven't found any single source with a useful selection of slow cooker recipes. I've had to copy mine into a text file one at a time as I come across one that sounds good. Sorry!
If you find a good site, I would like to know as well.
Never trust a skinny chef!