Only a designer knows the value of readymade vector. Free readymade vectors give the easiness to design something. Free vectors not only make easy of your design but also give verities of ideas.
Like every web or graphic designer I also keen to find new free vectors. It is true that there are lots of vectors in different resource sites, but most of them are paid. For my use and our visitors I make a deep search for free vectors and I have gathered 25 huge collections of full free vector galleries. Hope these will be helpful for the designers.