New Post: Add Summary next to Product in productlist.

If you're using the default templates throughout, there's a flag in the Back Office settings called productlistrows.flag (from memory)

Set that to Yes and then change your list module settings to show one column.

That is a built-in example of an alternate list layout that has the summary visible.

Anything else and you'd need to make your own templates or modify what's there.
Regards
Rob