You could probably guess it from the URLs
It's a german image-hoster with imho good speed and good options: www.abload.de
A registration is really worth it, you can create galleries, delete your images, retrieve links for all of your uploaded images, etc.
PS: if you substitute
in the URL for the thumbnail with
you won't be redirected to the abload-page (showing image in an iframe) but directly to your image