Literally ran into a few of these recently… here’s a large (probably about four inches or the size of your hand’s palm) female Nephila sp. (I’m guessing N. clavipes from Google searches of nearby orbweavers) and one of her hopeful mates. I counted three males associated with this web, and Wikipedia claims that these spiders are often parasitized by kleptoparastic Argyrodes spiders that steal captured prey from her web.