PageSnap.net is a web app that instantly converts any HTML page into a PDF document. Just enter the URL of the website, click Generate PDF, and the website will be converted into a PDF document that you can easily download. Each document is stored on the server for 7 days, after which it is deleted. Furthermore, the website offers users with two languages, English and Polish. You can convert the page to Polish language by clicking the button displayed at top of the page.
To start off, just click the Generate PDF! button. On the right hand side you will also be able to view PDF documents generated by other users. The PDF documents you create are stored on the server for seven days, after which they are deleted.
It is still in beta form, but I tested and it's a pretty good free web app.