Here’s a useful looking tool. It’s called Dabble, and you can use it to grab web data, throw it into a database, and manipulate that data, all without the need for programming. Here’s a demonstration on how to extract data from Digg.
There’s a few demos on the site – essentially it’s a mix between an online spreadsheet and database application.
“Search through your data instantly. Navigate via links and backlinks. Interactively group, sort, and filter the results. See your data in tables, charts and calendars. Save each view and share it with others“
I’ve had a play, and it seems quite easy to use. There’s a free sign-up trial period for one month.