Reduce display brightness to lesser than the least possible windows setting - How?

Like the title says, I need to reduce my laptop’s display brightness. At night, I use the minimum possible setting that Windows 7 allows. Still, I feel it is too bright for comfortable viewing. Is there any way I can reduce it beyond this level? Any application or any workaround?

I use a Dell Inspiron 14r.

Here is one i used http://download.cnet.com/Monitor-Brightness-Reducer/3000-2072_4-10690260.html Strangely it does not reduce the brightness of taskbar.

#challapradyumna Thanks for the suggestion. I also managed to find this: http://www.mylittlehost.com/dimmer.aspx

It works fine too, and provides a slider to adjust the dimness. And it also dims the taskbar. Try it out.