to Your Grace:
There's a lot more on this topic both in this thread and on the
Amazon community forum.
The point is that for purchasers in Australia (unlike most other countries) the Kindle 2 and DX are shipped without a mains charger. Therefore the options for charging your future Kindle are:
1) to charge via the USB port of a computer - which works fine, but has caused some annoyance for some people who want to be able to charge their Kindle away from a computer
2) to buy a wall charger which delivers USB-type voltage: as explained here and elsewhere, only a few models of wall charger will work with the Kindles.
If you want more information, I suggest you take the time to read the Amazon community thread referenced above.