100.000 to 1.000.000 write cycles seems to be the norm and that's per bit so to speak, it simply means you can 100.000 to 1.000.000 times fill your card before it would be wear out.
Many brands now have technology in them the distribute the data over the last used bits so that the card wear out evenly.

Unless you're a very heavy user they should easily last up to 80 years and certainly more.

I agree with Doug, the Samsung white cards have very good reviews I was planning to buy them but it's hard to get hold of them here so bought Sandisk instead.

I think I need to upgrade my pc to handle to raw files

The ISO800 looks a bit noise don't you think but still pretty good.

WR (Wash-machine Resistant) ?

That would be something for the Jessops staff to say

Yep you now have.
Aero Snap
Aero Shake
Aero Peek - this the little preview window when you hover over the icon in the taskbar
Aero Flip - press windows + TAB, you can then click with you mouse to which window you want to go or press TAB to go through it one by one, you need to keep windows pressed.

You mean you can't wash a lens and use it more than once...

My conclusion is that the SD card isn't your problem and I'm glad you found the problem.

Btw, Sandisk Extreme III can be classified as Class 10 cards.
It's a class 10 if it has 10MB/s speeds or over. with tests you see the Sandisk Extreme III have a stable 16 to 18 MB/s so they are most likely faster then some class 10 cards.

btw Dutch garden gnomes go on world trips, has yours every been on vacation? link

I mean yellow as in coward, I try to make a word joke once and it doesn't work

The K-X has a buffer that can hold 5 RAW photos or 16 jpg's therefore the performance of the first 3 photos can not be influenced by the speed of the SD card.

Also the fastest official SD class is 6, Class 10 isn't official so far as I know.

Also the Sandisk extreme III are very fast cards, 20mb/s or 30mb/s if you have the new ones so speed can surely not be an issue here.

When you drag a window to the top of the screen it will go full-screen.
When you drag it to the left it will open fully but only on the left half of the screen and you can do the same on the right side, that's very handy if you're moving files.

the short-keys are the "windows" button and then arrow up is full screen, left is left half of the screen and right is right half.

Also a very easy trick is that you can "shake" a window and then it automatically minimize everything besides that window. If you shake again everything comes back up again.