I will third Auaarons' recommendation. "L'estro Armonico" and Nigel Kennedy comes close, but no one matches the sheer exuberance of Fabio Biondi, especially in that 3rd movement of Summer.
Vivaldi fans lend me your ears for a moment...
Being a fan of Vivaldi's music but not completely fluent I need a little help. There is a piece of music that I am pretty sure is vivaldi playing when you first enter this website http://www.claytonaudio.com could one of you kind folks help me figure out what the title of this piece is so I can add it to my collection and if you have any favorite recordings of it please share it with me :o) Thanks you.