This table is from the Afrobarometer website. You would think that every cross-national survey would have a page like this but I've never managed to track one down on some surveys I'll not mention, while others hide it so effectively it might as well not be there.
Your site can have as much on it as you like but before anything else the following three things should be linked prominently from the front page:
- A table like the one above
- Links to the original questionnaires for each country
- Links to the raw data files, preferably as completely merged as possible