For the sheer scope and scale of useful little programs for your iPhone or iPod Touch â€“ known simply as â€˜appsâ€™ â€“ this platform just canâ€™t be beaten.
At the last count, there were over 50,000 apps you can find in Appleâ€™s App Store, many available completely free.
Think of something that interests you and the chances are good thereâ€™s an app for it.
Hereâ€™s a new one that is right up there on my list of apps that many people will simply find useful â€“ the ability to do your grocery shopping from your iPhone or iPod Touch, wherever and whenever you happen to be.
The company says it offers 18,000 product lines including Waitrose (and John Lewis-branded) goods for home or office delivery to locations across much of England, from the northwest to the south coast.
Home shopping for groceries is a growing business area in the UK, with researcher IGD predicting that the overall market will be worth Â£5 billion in 2012.
From a user point of view, an app like Ocadoâ€™s is extremely convenient. None of the other major supermarkets in the UK â€“ the leaders being Tesco, Sainsburyâ€™s, Waitrose, Asda and Morrisons â€“ offers a similar app (although Waitrose does with Ocadoâ€™s).
Of course, everyone offers home grocery shopping these days from a computer but only Ocado gives you the means to do it seamlessly on the go with an iPhone.
Quoting Jason Gissing, co-founder of Ocado:
[â€¦] this is the first step of a journey that will eventually see Ocado available on several digital platforms.
Good news for mobile customers. iPhone users are already a jump ahead.
The app officially launches on July 13 but is available in the App Store now; search for â€˜ocadoâ€™ and youâ€™ll find it.