The Status Bar lives below the Ribbon and displays persistent information such as page status or website alerts. It already existed in MOSS 2007 as a UI element but it's functionality was not exposed as an API. It will display an HTML message, which can include links and/or images, on one of four pre-set background colours depending on the importance of the status defined.
SP.UI.Status.addStatus(strTitle, strHtml, atBeginning) SP.UI.Status.updateStatus(sid, strHtml) SP.UI.Status.removeStatus(sid) SP.UI.Status.removeAllStatus(hide) SP.UI.Status.setStatusPriColor(sid, strColor)
Notifications are brand new to SharePoint 2010 and they are used for transient or semi-transient messages such as action confirmations. Notifications appear on the right side of the page below the ribbon and default to a five second display period. Like the Status Bar, the message format is HTML with the ability to include links and/or images.
Notifications are in the SP.UI.Notify namespace:
SP.UI.Notify.addNotification(strTitle, bSticky, tooltip, onclickHandler) SP.UI.Notify.removeNotification(id)