Opera 8.0 will provide Voice command support
http://news.bbc.co.uk/2/hi/technology/4208751.stm

Net browser Opera 8.0, due for official release at the end of next month, will be "the most accessible browser on the market", according to its authors.  The latest version of the net browser can be controlled by voice command and will read pages aloud.

The voice features, based on IBM technology, are currently only available in the Windows version.  Around 50 voice commands are available and users will have to wear a headset which incorporates a microphone. 

Opera is free to download but a paid-for version comes without an ad banner in the top right hand corner and with extra support. Its browser is used by an estimated 10 million people on a variety of operating systems and a number of different platforms.