Did you ever want to have a hard bound copy of the current data that is on Wikipedia for reference and archival purposes? PediaPress is a paid service that allows you to collect Wikipedia articles and entries and will print and bind them into a book. They are also offering the service in German (with more languages to come in the near future). This is a great tool if you teach in the languages or humanities (think of all the data, from culture to history, you can put into a book). You can choose long entries or short entires (short entries would be great if you would like it as a reference book). You also support the WikiMedia foundation when you create a book. To see the price and cost of printing, you can visit their website (linked below).