apples and oranges, just experimenting myself. Getting it to load up a webpage of your choice is quite simple. Download and install the firefox speech command pack, think its on lifehacker, ill maybe find the link.
Once thats installed open the speakable items folder, and browse through till you find the firefox commands. Look for one that says 'open dig or open giz' basically one a voice command file that opens a website, then open it using the text editor.
Now im sure it would be easy to copy and paste all the data within the file to create a new file, but im lazier than that. I editted the 'open dig' file, changed the url to what i desired and saved that.
Then after closing the text editor i renamed the file to the site name, i actually changed it to the bbc site but named it
'open b b c' to make it easier for the text editor to understand my meek voice. Finally when renaming the file make sure it has the extension open sitename.webloc
it was that webloc extension that took me a while to find, relatively new to macs.
Hope this is useful to anyone, im gonna try and get 'enter' working now