I think that of TechRep blogs, it's only Susan's that present this annoyance. Coupla workarounds:
1. If you browse in Internet Explorer 8 and aim to create a searchable MSWord file, you can Sel_Copy TEXT portion, then paste into Wordpad. In Worpad Sel_Copy then paste into Word. Blackbackground will be gone. GRAPHICS you must capture separately, using, say SnagIt.

2. If you browse in, say, FireFox 3.0.1.9, you Sel_Copy and paste directly into Word, graphics and all.