m3u files are only the listings...not the actual music files, as far as I know....
On soundclick, as far as I can see now, you should be able to download the mp3 file itself....(appears that this option is not available for all songs)
Streambox VCR lets you download audio streams and isn't too complicated.
Another way around it is as follows (don't know if you are supposed (allowed) to do this, but it works for me):
The streamM3U.m3u file, open in notepad.
Copy paste the link in that file in a html file you just created with HTML editor (Word may do even, but save it as HTML), use as clickable text something as "click here".
WHen you then open the HTML file in MSIE (or any other browser), you can rightclick each of the created links and select "save as" and you should be able to download the MP3 files, that can later be burned onto CD as Audio CD.