The U1010 is about twice the size of a smart-phone, yet it's a fully-fledged Windows Vista-based tablet PC. It's suitable for professional users, or even regular travellers, who want a very mobile device with all the functionality of a typical computer. Unfortunately, it lacks built-in 3G features.

A solid ultraportable ultimately let down by poor battery life.

The Fujitsu Lifebook U1010 3.5G is a great example of the increasingly popular ultra mobile PCs. It's easily held and is comfortable to use while also being extremely portable. If the size and weight weren't enough to get you excited then the addition of 3.5G HSDPA speeds of up to 7.2Mbps should help.

A mixture of smartphone and notebook, this stylish ultraportable from HTC lacks the strengths of either category and will not satisfy business users on the go.