But ask for her phone number for something cool - "Phone for Jane Doe". To dismiss the window just say OK. Also, if you want to send Jane a file(s), select it in the Finder and say "Send this to Jane Doe." This command is context sensitive - try it by selecting some text or a picture in iPhoto or while in a web page.
To see all the speech commands associated with the address book just say "Open speech commands window" and look under the Address Book heading.
[robg adds: For some reason, I cannot get speech recognition working with the iSight (my only mic). It looks like it should work (input level is varying with speech), but nothing happens ... so I can't say I've tested this one.]

