There are many online services that can convert webpages to PDF files. These may be of use for printing or archiving internet pages.

With Web2PDF, you enter the internet address of a particular page on the internet into an online form. When this is submitted, the document is converted and presented to you as a downloadable document.

Quickly transferring breaking campaign news into paper form for immediate distribution
Creating printed handouts for an awareness-raising workshop
Taking snapshots of webpages to view offline -- useful for researchers in areas of limited internet access

Very fast and easy to use
Converting a page by sending its URL by email to the site is also possible

A good internet connection is needed
There is no flexibility over layout and web pages often contain extra unwanted information
Not an open source service

Commercial but free