[XeTeX] babel or polyglossia?

[Benjamin Koppe]

Hi,
I just thought about dropping the use of packeges ngerman and/or babel  
and switch to polyglossia, as this seems to be the better choice  
around xetex. Somehow I could not get German quotation marks working.
Usually there is either the \glqq and \grqq commands, or rather the  
shortcuts "`and "'
Neither of them works with

\usepackage{polyglossia}
\setdefaultlanguage[spelling=new,babelshorthands]{german}

Are the quotation marks handled with another package? Or is there any  
reason to drop babel (actually I just felt like being up to date to  
switch, can't yet see a big reason).

Thank you
De Benny