Kindle on MacBook Pro

Hi,

I have kindle installed on my MacBook and on all my other apple devices (iPad, iTouch, iPhone 4). I have a few books say maybe 30 or 40 in total and that includes the sample books.

Now I cleaning up files from my HDD and I noticed that there is a folder called "My Kindle Content" that folder is over 4GB big! That seems a bit excessive, does anyone have any idea what gives? I would like to claim that space back although I am afraid that may not be possible. I wonder though why all that space.

If anyone has any idea please let me know.

Thanks,

Ilias