@Robert I agree with you to stay away from feeds. Its better to read a book and gain some in-depth knowledge....
However here are some that might help (with Rails and Ruby):
http://www.buildingwebapps.com/podcasts (Rails)
http://www.peepcode.com (Rails)
http://www.learningrails.com (Rails)
http://www.railsenvy.com (Rails)
http://www.bofh.org.uk/articles/category/ruby (RUBY specific)
http://www.pragprog.com (ruby)