I know that I’ve mentioned her before, but it still surprises me that some people are not aware of her work. I found a page today which has a nice little rundown:
The juxtaposition of word and image in Barbara Kruger’s highly recognizable work is derived from twelve years as a designer and photo editor for Conde Nast publications. Short, pithy caption-like copy is scattered over fragmented and enlarged photographs appropriated from various media. Usually declarative or accusatory in tone, these phrases posit an opposition between the pronouns “you” and “we,” which satirically refer to “men” and “women.” These humorous works suspend the viewer between the fascination of the image and the indictment of the text while reminding us that language and its use within culture to construct and maintina proverbs, jobs, jokes, myths, and history reinforce the interests and perspective of those who control it.
They also post several images. If you’re not familiar with her work, you need to be. Not only for the political discourse involved, but also because she’s probably in the direct genetic line of many current internet memes.

Well, maybe a little forced there, but you get the point.