Dragon standard and preferred?

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Just a bit of advice please people. Its my Hal 6's birthday soon and I would like to get a good speech recognition software for her and me, so my question, does anybody know the difference between Dragon 9 standard and preferred? Apart from the price I can't find any differences, there obviously must be some but can I find any site or info on this? NO, so any help would be greatly appreciated.

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Its ok, I found a page that explains it, here it is should any one else want to know.

http://www.voicerecognition.com.au/dragon_faq.htm