Heh...how's THIS for "quick'n'dirty"?
I was watching a comedy routine on my TV card last night, and just for kicks I pulled up XP's "sound recorder" (sndrec32.exe) and hit the record button. Well damned if the little mini-scope didn't start reacting! After a minute or so, I hit the "stop" and then went to "File" => "save as", and saved whatever I had to a wav file on my desktop.
I played around some more with audio files, movie files and even went to youtube and watched a few vids...I racked up almost a gig of wav files as windows sound recorder faithfully recorded ANYTHING that came through my speakers!