Thumbnail with caption

Hi,

i have been looking around for a plugin that does what the front page of wordpress.com(thumbnail with text etc) does for my current website. On my site i have the idea working but i want to convert my site into wordpress and use it as a CMS , but i am struggle at the part of my portfolio where i cant convert it into wordpress..

So my question is does anyone know which plugin does wordpress.com use for it thumbnail + title thing ?

hope to get some help soon

regard
wing