VidCoder is a free tool based on the Handbrake encoder, that aims to make using Handbrake to convert video files, DVDs and Blu-ray movies to MKV or MP4 files a much easier affair. On that front, it succeeds.
The installation process is an ease, once you have the required .NET 4.0 framework installed, and unlike other GUIs, where it sometimes requires manual or prompted installation of third party tools, everything is done for you seamlessly within the VidCoder installer. There are 32-bit and 64-bit installers available, with both versions having the exact same featureset, except that the 64-bit version does not handle closed captions.
DVDs and Blu-rays are read and scanned without any major issues, and it's one of the most easiest software to use when it comes to converting just a small section of a disc (you can select segments by chapter, or by time).
A big problem usually with encoding tools, particularly GUIs, is that some are over simplified, while others present far too many options. VidCoder seems to balance the needs of beginners and more advanced users brilliantly, and the tool can be used simply as a "almost one click" encoder, or you can use it to control the precise encoding settings of the output.
Presets are provided for most of the more common iDevices, including the iPod, iPhone, iPad and even Apple TV. There is also a Normal and High Profile preset. A possible area for improvement would be the addition of more presets, such as for the Xbox 360 or PS3, although anyone can create their own presets quite easily.
There's also a lot of emphasis on batch processing features, with features like auto-naming, job queueing, and even automatic pausing when certain other processses are running.
While there are still some bugs present while I was using this software to write our VidCoder tutorial, the software itself is very stable, and works without the fussiness you normally associate with other GUIs.
VidCoder is highly recommended.