With the most recent iOS on your iPad, iPhone or iPod Touch you can use AirPrint to print a document from some apps to some printers. Find out which printers are compatible and how the printing process works.
You can use the Pages Per Sheet setting in the Print dialog box of almost any app to combine 2, 4 or more pages to one sheet of paper. This makes the print smaller, but can be useful if you are trying to save paper or only print a backup copy of some information.
When you print you actually launch a print manager app. This app allows you to see which print jobs are waiting, pause them, and even result them if they have failed while in the middle of printing. You can also use a viewer to see what is being printed.
You don't always need to print an entire document. Sometimes only a portion of a single page is all that is needed. By using OS X's ability to print to a PDF that opens in Preview, and some quick keyboard shortcuts, you can select and print only a small portion of a page, therefore saving paper and ink. This tip works for web pages, documents, or anything that can be printed.
You can print both labels and envelopes from Address Book without needing to do a mail merge or use another app. You can choose from many different standard label templates or create your own. You can also choose different envelope sizes. You can print them in bulk, or just use this feature to print a single envelope.