By default, Google Analytics shows reports till yesterday and you have to manually adjust the calendar gadget to show the report for today.
If you're using Firefox browser with Greasemonkey Add-on, there's a Greasemonkey addon script that will do it automatically for you whenever you view your reports.
To show Today as the view, get the script here.
To be able to show the entire previous month's report including today, there's another script here.