Speech recognition and voice search aren't "commodities" but there's a perception among some that they are. Vlingo is trying to move beyond simply being a voice services provider to a more holsitic "personal assistant" type service (a la Siri). Along those lines the company has integrated "check ins" with Foursquare to its roster of capabilities (on Android).

I tried it on my Android Evo and found that it worked very nicely. Several spoken "check in to X" tests worked smoothly. It's a lot easier than launching Foursquare and pulling up the venue -- even though that's fairly easy too. 

Another impressive feature is the ability to ask "where are my friends?" You simply speak this into Vlingo and it searches Foursquare for your contacts and pulls them up. That also worked easily and quite well. 

The video below illustrates how it works.