Is there any way to subscribe to RSS comment feeds from a SharePoint 2007 blog? Or to include comments in the standard RSS feed? Some easy way to be notified or new comments to a thread via RSS?
Sharepoint is pretty limited and it does not follow standards like most blogs, so out of the box without more tweaking / work arounds you cannot just consume an RSS/XML feed for comments.
Your best bet is to find a way to use the Content Query Web Part (Publishing Feature required) - it has an option to publish an RSS feed of its query results.