Evernote is an application and web service that lets you capture, store and synchronize information on your iOS device, PC and online, all at the same time. It allows you to store all manner of items, including text notes, voice notes, images and files.

Once you've installed the program on your device, you'll need to sign up for a free Evernote account. After this short registration process you'll be presented with a very clear and touch-friendly interface. From here, you're just a tap away from adding a text note, a handwritten ink note, taking a snapshot on your camera, recording an audio note, or uploading a file.

The revamped Evernote interface in this fourth version of the app makes adding and managing notes very simple. Touch the plus button and you can add a quick note, with one-click options for adding tags, location tagging, in-line voice recording and adding pictures by taking a snapshot or browsing your Camera Roll.

Evernote for iPhone makes it so easy to peruse your notes. You can view all notes in a timeline, browse by notebook or tags, or search through all your notes using keywords.

Now, whenever you don't have your iPhone in hand you'll be able to access any notes or files you've added in Evernote from any web browser. These can then be edited, deleted, printed or emailed at your leisure. Personally, I found the layout of the online interface quite uncomfortable - unlike the hand-held version of Evernote, the text is very small, and the strange menu system makes browsing through your items overly complicated.

From the browser-based version of Evernote you can add notes and files like with the device version. There's also a 'web clipping' tool, available as a Firefox plug-in, which lets you quickly grab web pages as you browse and save them to Evernote.

All in all, Evernote is a powerful productivity app that ensures you're never far away from your important information.