Aside from letting you read PDFs with your smartphone (finally, you can read your favorite e-book!), Pdf+ also allows you to password protect your files. Meaning your kid won't accidentally read your racy Romance novel.

Another great thing is that Pdf+ opens the same PDF files you use on your computer. This means you don't need to convert your electronic library into a proprietary format, and any PDF you download from the web or receive through e-mail, Bluetooth, or IR can be immediately opened.

There are some limitations to what Pdf+ can do (check out the product description for more details). But Pdf+ looks to be a great solution; you can actually upload your smartphone's manual, which is usually PDF format, and read it while on-the-go. Pdf+ for Series 60 3rd Edition Symbian smartphones goes for $24.99 from Handago.