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If you have a portable device with a free microSD card slot then you're really wasting it if you're not making use of it. That microSD card slot offers a cheap and easy way to boost the device's storage. Even if it comes with a card, chances are that you could upgrade it to a bigger card for only a few dollars.
Check out the manual for your device to see what the maximum card capacity it supports is.
Price: Starting at $10 for 4GB.
The battery life that devices promise can vary considerably from the battery life they actually deliver, and because of this, it is always a good idea to carry with you some extra juice in the form of an external battery pack.
Carry a whopping 12,000mAh of power – enough to recharge an iPhone six times according to the manufacturer – in your pocket with the Anker Astro3 (CNET battery comparison). This battery pack doesn't have any buttons, and all you need to do to start it charging or to check the power levels is to give it a shake.
One of the biggest productivity boosters you can add to any post-PC device is a keyboard. While on-screen keyboards are great for tapping out a tweet or email, they just aren't up to the challenge of typing out reams of material.
Add a keyboard and your smartphone or tablet becomes a true content creation machine!
My personal favorite keyboard for iDevices is the Apple Wireless keyboard. (CNET best keyboards). It's expensive, but it's reasonably slim for easy transportation, very ergonomic, tough (unusual for an Apple product), and very comfortable to type on for long periods.
Price: Depends on what you go for.