Alexander Chen made this animation of the New York subway in HTML5 and Flash. It turns the colored lines into little strings that are plucked when a trains runs over it. Longer strings make lower tones. Phantastic idea, consequently thought through and brilliantly executed. Beautiful!

This beautiful A0 poster by Information Architects gathers the data of the top 140 twitterers. High data-density, very well laid out. Download the free PDF file to see it in all its glory.

Pretty extensive, light-hearted and funny flowchart on the choice of the right typeface for a design. By Julian Hansen.

Beautifully simple info graphic from informationisbeautiful.net.