Assistant - Speaktoit comes a very close seconded but this is more to do with personal preferences then anything else. Speaktoit works fine I just preferred using Jeannie more. Both have there bugs and could do with improving but these two apps are by far the best Siri type app you can get for Android.
So the apps don't sound like an old Speak and Spell I would install IVONA Text-to-Speech HQ.
Edited by Pinguy, 10 April 2012 - 12:38 AM.