Limbo is one of those. You can tell from the above screenshots that the game is highly stylised - My impression that that you, as the small Boy in Silhouette, have to run around a forest and an industrial factory and avoid being smushed by falling boxes and impaled by spikey trees. The 2-dimensional, sidescrolling aspect of the game reminds me of classics like "Out Of This World" and "Flashback" (both by Delphine Software), but the fact that the designers of Limbo have chosen to present the game not only entirely in black and white but also almost exclusively in silhouette appeals to me.
The website is perversely void of information about this game - how far along it is, when it might be released, even information on the storyline - but what is there is more than enough to pique anyone's interest. If anyone knows anything more, feel free to email me.