Shift+Delete should work.
... sorry, new answer ...
Shift+Delete or Alt+Delete
But watch this screen recording: http://www.youtube.com/watch?v=Xo5IO7aD-sg
after trimming the clip from the beginning (okay, instead of ripple trim) I am deleting two parts of the clip, each time by cuting the clip 2x and deleting the middle piece.
It would be cool to make only one cut (the second one) together with deleting the part before.
... because I have to do this very often