Okay, that article talks about using a card reader in conjunction with an SDHC card. Are you trying to use the type of card reader that can read all different sizes of cards - and connects to a PC via a USB port?
If so, yeah, they may not work because of Apple's downgrade of the power support in that USB port (with iOS 4.x). So, try using just the SDHC card in the other piece of the CCK. A direct feed of an SD card has never failed to work for cards up to 32GB ... AFAIK.
If you need a reader (because your card is too small/too big to fit in the Apple CCK), I've successfully used the Transcend USB card reader in this link [ame="http://www.amazon.com/Transcend-Flash-Memory-Reader-TS-RDP5K/dp/B001NS828K/ref=sr_1_1?ie=UTF8&qid=1311196520&sr=8-1"]here[/ame]. It's only $8 (USD) at Amazon and while I generally use just the card, sometimes you have to use USB connections (or different size cards). This little USB reader is handy to have for those situations...