Ludwig Gatzke organized around 200 dot-com logos in this beautiful and very trendy mashup:
Gatzke gave Valleywag permission to play with this map. Mark it up any way you want — cross out the dead companies, connect the Yahoo buyouts, or, well, do something cooler. Then e-mail it to firstname.lastname@example.org with "logo 2.0" in the subject line.
The top four markups will compete in a Valleywag reader poll, and the winner gets a pile of Yahoo schwag.