W3C accepted XMLHttpRequest

Finally W3C accepted the XMLHttpRequest as an standard object.
You can review the draft of specification here.

And from now on all the browsers will have a united way to create an object of this class:

var client = new win.XMLHttpRequest()

And more cross-browser compatibility!

The interface that all browsers have to implement for this object (class) is like this:

interface XMLHttpRequest {
// event handler
attribute EventListener onreadystatechange;

// state
const unsigned short UNSENT = 0;
const unsigned short OPENED = 1;
const unsigned short HEADERS_RECEIVED = 2;
const unsigned short LOADING = 3;
const unsigned short DONE = 4;
readonly attribute unsigned short readyState;

// request
void open(in DOMString method, in DOMString url);
void open(in DOMString method, in DOMString url, in boolean async);
void open(in DOMString method, in DOMString url, in boolean async, in DOMString user);
void open(in DOMString method, in DOMString url, in boolean async, in DOMString user, in DOMString password);
void setRequestHeader(in DOMString header, in DOMString value);
void send();
void send(in DOMString data);
void send(in Document data);
void abort();

// response
DOMString getAllResponseHeaders();
DOMString getResponseHeader(in DOMString header);
readonly attribute DOMString responseText;
readonly attribute Document responseXML;
readonly attribute unsigned short status;
readonly attribute DOMString statusText;
};

It's also natively implemented in IE7 which means no more ActiveX. ;)