Some of the blogs like the one from Datameer don't have any feeds, but still I would like to get the changes to the blog in Google Reader.
Google Reader used to support this feature, but it no more works.
The google thread manually create a feed treats exactly your problem.
The advice there is to use Page2RSS, a website that claims :
I tried it by entering your datameer.com blog url into their "Page URL" field, hit the "to RSS" button, then under "Subscribe to Feed:" I clicked on "Google Reader". It then passed me to a google page where the button "Add to Google Reader" seems to have really added a feed to Google Reader.
(Also see Yahoo pipes tool which uses feedity. Yahoo pipes is useful for combining feeds and other stuff.)