Nuance Dragon NaturallySpeaking 10 Preferred

In addition to standard features, Preferred-version has support for Bluetooth-enabled devices and allows you to perform searches on the Internet and your computer using voice tags (eg: "Search the Web for global warming articles", "Search Wikipedia for George Washington Carver" ;). The program, unfortunately, only supports English (UK and US)! However, you can make your own profile, recording into a microphone the words and phrases, which can then be used when using the computer. 
Key features: 
• Accurate speech recognition for applications 
• Create and edit documents and spreadsheets voice 
• Sending mail, instant messaging and surfing the internet voice 
• Up to 99% accurate speech recognition 
• Easy to use 
• Use with multiple applications 
• Search the Internet and a computer using voice tags 
• Bluetooth devices

System requirements:

• CPU: Intel Pentium4 or later or AMD Athlon 64 1 GHz or later. (SSE2 instruction set required).
• Memory: 512 MB RAM (1 GB RAM for Windows Vista)
• Free hard disk space: 1 GB (2 GB for localized non-English versions)
• L2 Cache: 512 KB

Supported Operating Systems:

• Windows Server 2000
• Windows Server 2003
• Windows XP SP2 or higher, 32-bit
• Windows 2000 SP4 or higher
• Windows Vista or Windows Vista SP1, 32-bit
• 64-bit OS not currently supported

• DVD-ROM drive (required for installation)
• Microsoft Internet Explorer 6 or higher
• Nuance-approved noise-cancelling headset microphone (included), Creative Labs Sound Blaster 16 or equivalent sound card supporting 16-bit recording, speakers (required for playback of recorded speech and text to speech features)
• A Web connection is required for activation 6.