I seem to be able to login at the moment. Didn't try queuing.
http://www.leagueoflegends.com/board/forumdisplay.php?f=20
Usually, it'll say here if the servers are down.
Also, for anyone's information, if the first screen shows "UNAVAILABLE" or "BUSY" you can still login sometimes. Using the arrow keys you type the following:
Up Down Left Right Up Up Down Down
And Busy/Unavailable will turn into Available.