Here's some pictures of SD cards so the next time you buy an SD card you'll know what to look for!  Unfortunately you can't tell what's on the back of the card until you open the package the card comes in. 

Oh, and here's a comment to Lexar - PLEASE PLEASE PLEASE PLEASE PLEASE!!!  Package your SD cards with a reusable plastic case PLEASE?

Front Back Description Benchmark

Sandisk 256mb SD card - N Series

Hopefully this is a working Sandisk card!  See here

Thanks to Slava for the pictures!

  

LexarMedia 256mb SD card - newer series

This is an example of a Lexar card that appears to be the same as Sandisk (and others).  None of these works on my Dell Axim.

  
       

LexarMedia 128mb SD card - older series

This Lexar card works well.  I've changed the colour a bit so the text on the back is more visible. A good example of the "landscape" type Japanese card.

  
       

PreTec 128mb SD card

This Pretec card works well too. Stamped along the bottom is the words "Made in Taiwan"... Note the rounded corner rather than the cut-out, and also the lack of a write protect switch!!!

  

 

 
       

SimpleTech 256mb SD card

This card works well - it's my main SD card and I just can't get it to go wrong.  Like the Lexar 128mb card, I've changed the colour so the text is more visible.  Compare to the Lexar 128mb above, this is a portrait Japanese card.

  
       

Integral 128mb SD card

Spot the difference with the Lexar 256mb card above!  Similar code on the back, same errors.

  
       

Vmax 128mb SD card

This card has passed all my tests, including test four - the delete and read at-the-same-time test.  The back has been lightened so you can see the codes, plus Made in Taiwan..  The same manufacturer as Pretec maybe?

 
       

Infineon 256mb SD card

Just to prove that the SD card issue is a complex one, here's pictures from Neil S. (Thanks Neil!) - its his working Infineon SD card with an AK03 code.