This one bugged me a long time, and over the weekend I decided that it's finally time to roll it: I created a simple
QuickLook Plugin for CSV files.
The nice thing is - the Finder also uses this Plugin to create the
Finder Icons. For speed reasons I decided to limit the display to the first 200 rows maximum, but since this thing is Open Source, you can change that whenever you like. The project website is here:
http://code.google.com/p/quicklook-csv/. There you can also find a DMG containing a pre-compiled binary ready to use after download.
Rafael: Thank you very much, I was having a huge headache to solve the very same problem!