Does anybody know of a real time sports scores/stats web service?
If I had to do this, I'd probably consume and parse the Yahoo RSS feeds for score-related posts: http://sports.yahoo.com/top/rss
They are well-categorized and Yahoo's feeds are pretty reliable. I don't think there is an official API for this information.
I found several places on the web referring to a developer API for scores posted by InGameNow, but don't find any mention of it on their site: http://www.ingamenow.com/ There's no specific documentation, but Ryan Spoon, a developer there, recommends you contact him personally, as of July of last year: http://ryanspoon.com/blog/2008/07/27/ingamenow-opens-api-for-sports-scores-interaction-what-can-you-do-with-it/
Edit: I've done a little investigation since I first posted, and getting scores out of the news feeds seems pretty tricky. This looks like some pretty commercially valuable information that no one wants to offer a free universal feed for. Current best advice? Screen scrape Yahoo sports score pages.
Edit2: The UPI feed does look very pareseable for scores. What's the usage case here? You trying to build something commercial? Looks like you could easily find yourself on the wrong end of someone's terms of service.
Reuters has an online service for sports. You might also check the other wire services, such as UPI which has an RSS feed that appears to include scores.