It looks like Vlingo is making headway in cutting deals with other popular Android apps because they've just created some integration with Foursquare. Vlingo allows you to use voice commands to perform common tasks. Some examples include updating your status on Facebook and Twitter.
If you are unsure what we are talking about, take a look at the embedded youtube video above as it pretty much shows you what's up.
I don't think Foursquare has really hit a critical mass with our userbase yet, but I'd love to hear from people out there who are really using it on a daily basis. Please let us know how it works and how the Vlingo integration makes it a better or worse experience.