Post Images/thumbnails with Site Wide feed on using wpmu with subdomains

Hi there,

I have been a wp mu user for about a year. I always had this question and have not found the answer in any forum. I use sub domains.

On my I would like to show the most recent posts with THUMBNAILS from each blog (subdomain).
I would not like to show avatars or anything else but the images associated with every post.

Is this possible? If yes do you know of any plugins or code that could do this?
Thank you very much in advance.