It seems .info domains are being penalized by Google.

Here's a discussion:
http://www.webmasterworld.com/google/3657421.htm

A little more circumstantial info:
Cutts says: "A top-level domain (TLD registry) will offer domains for under $4. The result will be another TLD blighted by spammy domain registrations. "
http://www.mattcutts.com/blog/my-2008-predictions/

Note the phrase "another TLD". TLD = domain name. "Another" seems to indicate that at least one domain name extension is a "blight".

This makes sense. While not all .info sites are spam, SEO bought them up as they are often cheaper. The fact that they are cheaper likely means they are more often used for spam.