Internet Download Manager has a smart download logic accelerator that features intelligent dynamic file segmentation and safe multipart downloading technology to accelerate your downloads. Unlike other download accelerators and managers that segment files before downloading starts, Internet Download Manager segments downloaded files dynamically during download process. Internet Download Manager reuses available connections without additional connect and login stages to achieve better acceleration performance.

What's new in version 5.17 Build 3? [Released: May 07, 2009]

We have added these features in response to IDM user requests.

• Improved media file recognition in web players in Firefox and other Mozilla based browsers
• Fixed several bugs
For more Detail - http://www.internetdownloadmanager.com/features.html