Have you have a look at Digg's new search features? Go have a look, cause they are great! You now get information like:

• The ages of submissions
• Topics / Categories
• The number of Diggs
• What types of media
• Can search by website Source (nytimes.com)
• Can search through buried stories, promoted stories, unpromoted stories, upcoming stories and more

Johnathan Simon, from Official Google Webmaster Central Blog, indicated that you can now include different Content types in your sitemaps. So now you can include images and videos in one sitemap.

This is what the code looks like:

Xbox Kinetic should be ready in November

If you are going to break your domain name via a hyphen/dash or an underscore, or your clean urls, I would suggest using hyphens. Use hyphens for your image file names to, it works!