Clint,
The guys are talking about PC Card memory adapters, like these:
http://www.sandisk.com/retail/pca.asp
I have only used the CF type, but according to the guys above, the SD cards work as well. Just pick an adapter for the memory card type you usually use.
If you don't already have any memory card, I recommend CF, because they are somewhat cheaper, especially for the larger capacity ones. Plus they are generally faster. Some bigger, usually professional, digital cameras also use CF for the bigger capacity and faster speeds.
But a lot of smaller digital cameras, other PDAs
(aham!
), and new laptops also use SD. SD is coming down in prices close to CF, so it's a good choice as well if you will share memcards with these devices.