cocoaforge

Is there anyway to have Growl show sports scores? Like a growl notification every 5 minutes of a score.

No. Growl doesn't arbitrarily query data sources and do things, it simply displays notifications.

That said, you could write a script (shell, AppleScript, Python, Perl, etc.) to do so or a full app. But there needs to be 'something' doing what you want and then informing Growl. Growl itself will not do so.

Is there any software out there that works with growl that would give growl scores to display?

No clue, you can find out here

http://growl.info/applications.php

There is nothing I saw there that would do that.

Where would the script get the score from?

You'd likely need to scrape a site like ESPN, MLB, or whatever sport/team you want to follow. It'd be incredibly fragile unless there's an API. You'd have to do research into whatever your desired goal is, as with any project