ESLListening.org is a site with songs, poems, podcasts, etc. designed to help you with your listening and comprehension skills through video and audio tools.
EnglishListening.com allows you to focus on certain passages and learn a number of different topics. Passages use different accents and genders to give you a wide range of dialects.
The BBC offers language learning tools on their site. This link connects to their listening resources (podcasts, learning programs, etc.) scripts and audio files available.
ESLbasics.com has hundreds of videos to help you with pronunciation, vocabulary, tongue twisters, idioms, phrasal verbs, and more.