I saw someone selling this card for £13 second hand on a forum and I bit his hand off, and then when I checked Play for the price I noticed that it's dropped to £12.49 -- the last time I checked I swear it was near the £20 mark. Even the cheapest on eBay seems to be around £20. Proper bargain if you're after the best 4gb SD card you can buy.
Remember, most photographers consider 2x 4GB better than 1x 8GB simply for being able to have a backup card in case one fails.
This is the Extreme III model (Class 6) which is the fastest SDHC speed available. I'm aware you can get Ultra II (Class 4) cards cheaper than this but the whole point of Extreme III is the very fast speed. If you have a D-SLR that has a good FPS you'll want a Extreme III card otherwise you'll only be able to take pictures as fast as the card will let you. It's also very handy for transferring the images to your computer as they'll send quicker.
Remember Quidco (which I didn't)!
This is my first submission on HUKD so pleas be gentle!