The broadcaster says the upgraded service has a host of new features all geared towards enhancing the user experience.
New elements include more efficient predictive search and viewer driven recommendations to help make it easier for people to find what they're looking for.
From next week, 4oD will also include 'My 4oD' for the first time, where registered users can sign in to access a number of enhanced features, helping them to manage and create their own preferred content. Users will be able to:
• Create playlists of episodes and schedule an evening's viewing or simply create a list of shows they want to remember to watch (My 4oD Playlist)
• Keep track of episodes they've watched or started watching (My 4oD History)
• Save favourites in a single place and get in-page reminders from Channel 4 whenever a new 4oD episode is available for them to watch (My 4oD Favourite Shows)
Optimised for in-page viewing
The new 4oD player is optimised for in-page viewing, and allows users to discover related and viewer recommended shows form the catch-up and archive libraries.
Sarah Milton, Channel 4's Head of VoD, says: "We have refined and optimised the design to ensure viewers get the best experience from the wealth of content Channel 4 has to offer.
"We have more than 5,000 hours of archive programming available on the Channel4.com 4oD service, and the redesign makes it even easier for users to browse our offering."
4oD is available through Channel4.com, YouTube, Virgin, BT Vision, TalkTalk, PlayStation3 and an iPad app.
A downloadable 4oD app for the iPhone and iPod Touch will launch in September.