I detected an issue in BE 2.8 related to duplicate content and SEO issues.
When you enable or disable the add date to the URL of the posts, BE does't redirect to the new URL creating duplicate content when reindexed by search engines.
For example, this link from dotnetblogengine.net
Lead us to the same content from this add date to url
Resulting in duplicate content as for the search engines. Also it happends when you change the root of the install folder of BE, for example:
For SEO purposes the 4 diferents URLs are duplicate content if not redirected to the correct URL
A 301 redirect could fix this issue, but the fix also have to check for extensionless URLs and WWW subdomains. I hope a patch could be released soon to fix this SEO issue.
P.D. I checked how wordpress deal with this issue, and seems to redirect to the correct URL in several ways. For example, all this URLs do a permanent redirect to the correct URL:
all do a 301 redirect to: