Hi Jazzgirl,
I have to admit that I gave you the link for the fielding positions with my tongue in my cheek but I'm glad that you found it interesting.
'Cow corner' is, to my mind, a derogatory expression because it usually conjures up the image of a batsman hitting across the line of the ball and depositing it over the wide legside boundary. By the same token, 'sweeper' is an expression that has evolved since the advent of limited-overs cricket and it is that fielder's responsibilty to cover anything that beats the inner field.
I apologise if that is rather heavy but, as you've probably guessed, I do know what I'm talking about as I learned all the fielding positions when I was still in short trousers!
With best wishes,
Caravaggio