PDA Memory Cards are a very popular means of immediately enlarging the memory capacity of a PDA. Most of the PDA Memory Cards that are in use today are of the SD memory card format, and their capacity ranges form 16MB to 1GB. The 2,4 and 8 GB cards are now in development, and are expected to penetrate the market during 2007 and 2008. Quite impressive for a memory card the size of a post stamp. The use of an SD memory card is great for installing additional software on your PDA, or storing more data on it. But it also enables your PDA to participate in what's called "The Bridge Media" concept that the SD memory card creators had the vision for.
The meaning of Bridge Media is that the SD cards can offer a way to connect many sorts of appliances trough one small memory card, without the need to use any interpretation.