col.js

Ledger.prototype.collection = function(callback) {
  var client = new DStore('experiment',new Server("127.0.0.1", 27017, {},{strict:true}));
  client.open(function() {
    client.createCollection('ledger', function(err, collection) {
      client.collection('ledger', function(err, collection) {
        callback.apply(this,[err,collection,client]);
      });
    });
  });
};

gist.js

Ledger.prototype.service = function() {
  var self = this;
  var http = require('http');
  var sys = require('sys');
  self.server = http.createServer(function(request,response) {
    var req = request;
    var resp = response;
    self.find_all(function(err,items){
      sys.puts(err);
      var callback = undefined;
      var query = url.parse(request.url,true).query
      if (query != undefined)
        callback = query['callback'];
      if (callback != undefined){
        var body = ";"+callback+"("+JSON.stringify(items)+");";
        resp.writeHead(200, {
          'Content-Length': body.length,
          'Content-Type': 'application/json;charset=utf-8'
        });
        resp.write(body,'utf8')
        resp.end();
      }
    });
  });
  self.server.addListener('close',function(errno) {
    sys.puts('close ' + errno);
  });
  self.server.listen(7001);
};

gistfile3.js

Ledger.prototype.find_all = function(callback) {
  this.collection(function(err, collection) {
    collection.find(function(err, cursor) {
      cursor.toArray(function(err, docs) {
        callback.apply(this,[err,docs]);
      });                   
    });
  });
};
# Same problems with this write of it
#
Ledger.prototype.find_all = function(callback) {
  this.collection(function(err, collection, client) {
    raise_if(err);
    collection.find(function(err, cursor) {
      raise_if(err);
      docs = []
      cursor.each(function(err, doc) {
      raise_if(err);
        docs[docs.length] = doc
      });
        callback.apply(this,[err,docs]);
        client.close();                       
    });
  });
};

thank you so much Christian for your thought and efforts.