It appears that Google has upgraded the Add Sitemap feature at Webmaster Central toÂ accommodate a broader range of media types on a site that might not be accurately reflected or have enough context in a traditional sitemap file:
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Google Upgrades Webmaster Central to Handle More Sitemap Types
by Mike Blumenthal
[...] Advertisers Are Happy But Scared Over New Google and DoubleClick Cookie Tracking. Searching For Olympics News And Video. StumbleUpon is Finally Removing the 200 Friend Fan Limit. SEO Have A Bright Future According To Google Insights. New Features at Mixx – Nested Comments, Domain Endorsing & More. How relevant is Cuil?. Google Upgrades Webmaster Central to Handle More Sitemap Types. [...]