Some times I have wanted to take a snap shot of a web page. You can do a Print Preview of the page, and create a pdf from this, but this splits the web page by page break. In addition, often browsers will put a header or footer on the page when printing.
Paparazzi! is an application that renders a web page, and allows you to save the the image in various formats. It looks like it uses Apple's WebKit to render the html, so the resulting graphic will look like the pages do in Safari. This may look different than the page does when rendered in Firefox.
[via Hawk Wings]