TechCrunch recently featured a guest post written by the famous Robert Scoble – one of the most popular (stalked) users of location-based services and someone who has more than 8,000 friends on Foursquare already!  The post was about what the location-based world could look like in 2012, and what might keep it from happening:

It’s January 2012 and you’ve just gotten your new Android 3.0-based phone. You’re going on a road trip so you start up the newly-released Foursquare. Gone are the checkins of 2010. Now you tell it where you’re going. This time we’re headed to Harrah’s at Stateline, Nevada. But this is no Foursquare you’ve ever seen before. They’ve finally integrated Waze, Tungle.me, and Yelp information into it. So, let’s discover more of what happens on our trip.

As we pull out of my driveway in Half Moon Bay we cross a geofence that sends alerts to the various systems that I’ve connected to Foursquare. Tungle.me knows I’m meeting Mike Arrington for dinner at Harrah’s. He gets an alert on his mobile phone that I’m on my way and Glympse sends him the ability to watch my progress so he’ll know if I’ll be on time. Plancast lets me know that four friends are attending the Black Eyed Peas concert at Harrah’s tonight. I see that Siri is offering to find me tickets, so I ask it to find me some tickets under $400 each…

… When we arrive at Harrah’s, we cross another geofence which lets Arrington know we’re here. It also checks us into Foursquare, and tells us: “there are 29 other people we know about, including three of your friends.” Then Siri (which received a message from our geofence) chimes in with: “are you still having dinner with Mike Arrington at 8 p.m. at Friday’s Station Steak & Seafood Grill?” I answer: “yes.” That goes away, but on screen is a Yelp review about that restaurant and I realize that the attire is dressy and I only have jeans and t-shirts. So, I ask Siri: “are there any other four-star restaurants like Friday’s Station nearby?” It answers with a list from Yelp and then it starts showing places that still have spots left for us this evening by querying OpenTable’s APIs. Siri then tells me it has found two seats for tonight’s show at Harrah’s outdoor arena, and asks if it should buy them from Stubhub?

Read the whole thing.  It’s fascinating.  And, the best part is that most of the technology Scoble talks about is already here!  It’s just not talking to each other, yet.