Sorry if this has been posted before but I use
This is a good free server that allows you to view Binary groups but the small text only files. It is good for seeing what is going on behind the scenes and means you do not have to sift through the large binary headers to see who is requesting this or who is saying thanks for that. Therefore it can also be used as a file finding tool. Find a poster saying thanks for "x" file and use a simple search program like grab it or newzbin to find the meaty stuff.
Hope this helps somebody.
Edit: This thread title should really be Good free text NSP for Binary groups.