Here's a timeline for the Siri:
http://www.sri.com/work/timeline/siri
As you can see, the research for this project actually began in 2003 or prior to 2003. I'm not saying who may be at fault but I would like to apply the following general rule for awarding software patents or patents in general:
One can be granted a patent if and only if they are the first to publish the work or research for an idea. For example, if person A publishes a research paper and person B reads an attempts to file a patent based on the paper of person A, then the patent will not be granted to person B and can be only granted to person A. Furthermore, this rule should be observed world wide; when you file for a patent, it will be recognized by all.
Next, I would like to state that personal assistants have been around for as long as 1966. Please think back to 'Star Trek' where crew members would initiate commands like 'Computer: locate Captain Kirk' and the computer would respond with something like 'Captain Kirk is not on the Enterprise'. This is just another implementation of a personal assistant which uses a different deployment platform (i.e. space ship computer) instead of a cell phone. Furthermore, this work for the TV series has been researched and published back in 1966 or prior to 1966.
Finally, I would like to consider patents are truly original ideas instead of people and/or companies today trying to steal from the past.