I initially thought there was a fault with my existing USB memory card reader since Windows wouldn't recognise this 4GB microSD card when I stuck it in the USB port, even though the card was recognised and works fine with my Nokia N95 phone.
After a bit of research on the net, I discovered that because this microSD card is the the new SDHC technology it requires a SDHC compatible USB card reader in order to be able to read/write using a PC. The normal SD card readers will not work with the newer SDHC cards.
I then got a SDHC compatible reader off a well-known auction site for £1.50 and it works fine and shows up on my PC now as a removable drive.
Another thing I learnt was the SDHC cards are available in different 'classes'. The higher the class rating, the faster read/write speed of the media. This card is Class 2, and is fine for using with my Nokia N95 for capturing Video and playing back MP3 tracks which play back without being jumpy or stuttering. However for SD card camcorder purposes you may be advised to go for a higher class such as class 5 or 6 for smooth video recording as they require huge data writing at fast speed.
I received the microSD card with a SD card adaptor only and no USB reader included. This wasn't much of a surprise since the product advertised made no claims about a reader being included. The customers who refer to the picture showing the pack with the reader included should note it was submitted by another user, and not the official Amazon product picture which just shows the card itself.
I bought direct from Amazon who shipped with free supersaver delivery as my total order was over £15 and it arrived very quickly, so top marks again from a once-more satisfied customer!