On Monday, SanDisk announced its new microSD high-capacity (microSDHC) card that offers up to 16GB in storage space. While 16GB doesn't sound like a huge deal compared with other media that offer hundreds of gigabytes, this is actually very significant for two reasons. First, microSD cards are by far the smallest in size among consumer storage devices--about the size of your little finger's nail. Second, it's also the most popular media for smartphones and PDAs, and it is becoming more popular thanks to its tiny size.
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http://news.cnet.com/8301-17938_105-10053696-1.html