Wyoming has about 500,000 people and gets a representative while places like california only get 1 representative for every 700,000 or so people. Isn't that biased in favor of the small states? But yes, they do have too much weight in the senate(something I'd solve by turning the senate into a soley ceremonial body).
Montana has over 900,000 in its CD.
The 7 States with a single representative are collectively underrepresented in the House. They are growing somewhat slower than the country as a whole (all but DE and AK), but once RI loses its 2nd seat the underrepresentation will be maintained.