The M600 from E-TEN builds on an earlier series of Windows Mobile handhelds, the most recent of which, the <a href="http://reviews.zdnet.co.uk/hardware/handhelds/0,39023880,39204636,00.htm">M500</a>, we looked at back in June of this year. Like its predecessor, the M600 is a connected Pocket PC, available SIM-free. Also like the M500, it is small and bulging with clever software. The M600 also rectifies one of the most annoying issues with the M500 by adding Wi-Fi support. And of course, it runs Microsoft's latest <a href="http://reviews.zdnet.co.uk/software/os/0,39024180,39197934,00.htm">Windows Mobile 5.0</a> operating system.