Melissa, no, we don't share copyrighted patterns on this forum -- if someone does post one (usually by accident) the mods will remove it. It's considered acceptable to share, say, a few lines of a pattern if you're asking for assistance with it, but not the whole pattern. That's a no-no.
I do occasionally copy patterns out of knitting books from the library...I figure that's more considerate than renewing the book over and over until I get around to knitting them.
But I find that if I fall in love with patterns in a certain book, I usually end up buying it eventually. :D