I always have problem when I want to convert video from 1 format to another, especially when format not supported by iTunes or Handbrake, format like RMVB. I found a converter that do convert rmvb to mp4, and its FREE

Miro Video Converter   Free%21 Convert any video to MP4%2C OGG Theora%2C iPhone%2C Android%2C iPod%2C and more%2C based on FFMPEG. 20100411 170447 iReview   Miro Video Converter

Miro Video Converter is newly launched, Free and open-source. It runs on both Mac and Windows. It is based on FFMPEG thus it supports tons of formats.

Some popular formats conversion supported by Miro Video Converter

Convert to MP4 Video

  • Convert AVI to MP4
  • Convert H264 to MP4
  • Convert MOV to MP4
  • Convert WMV to MP4
  • Convert RMVB to MP4
  • Convert XVID to MP4
  • Convert Theora to MP4
  • Convert MKV to MP4
  • Convert FLV to MP4
Supported Devices Includes:
  • iPhone / iPod Touch
  • iPod Classic & Nano
  • Most if not All Android
  • PSP
How does the UI looks?
Overall the User Interface is clean and simple. User can simply drag and drop files onto box, select the Device or Format you wish to convert to, then you are done!
Steps to achieve your first Video Conversion:

Step 1: Drag and drop the files you have selected to the conversion box
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Step 2: Select the device type or the format your wish to convert the video to
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Step 3: Wait, Conversion for 1 hour video normally take from 20-40minutes. Quite Fast
Miro Video Converter 20100411 170333 iReview   Miro Video ConverterStep 4: Finished! Click on Show File to show file’s location (It will be save to the same location where the original file is located)
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Overall I feel that Miro Video Converter is good enough for daily conversion as it have a very wide range of supported formats and devices. The only down side that I think of it is that there is no batch conversion or queuing.
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