gistfile1.js

var app = module.exports = express.createServer();
app.set('view engine', 'jade');
app.configure(function(){
    app.use(express.bodyParser());
    app.use(express.cookieParser());
    app.use(express.session({ secret: "a1b2c3d4e5f60000000000000" }));

});

app.post('/location', function(req, res){
    var lat= req.body.location.lat;
    var lon= req.body.location.lon;
    var updated_at= new Date();
    console.log(req.session);
    if (!req.session.host) {
	Host.create({lat:lat, lon:lon}, function(host) {
	    req.session.host= host.id;
	    console.log(req.session.host);
	});
    } else {
	Host.find(req.session.host, function(host) {
	    Host.update(host, {loc:[lat,lon], updated_at:updated_at}, function(uhost) {
		console.log("Updated client "+req.session.host);
		console.log(host);
	    });
	});
    }
    res.send("ok");
});

Here's what's outputting console.log(req.session)

{ lastAccess: 1307452842993,
cookie:
{ path: '/',
httpOnly: true,
_expires: Tue, 07 Jun 2011 17:20:42 GMT,
originalMaxAge: 14400000 } }
4dee25ab69f1552b74000001