There are a lot of popular software on the market. Thank you for your information. I also know some practical softwares. I want to share to the people who come this nice website. These tools are designed for video conversion.
4Videosoft Sansa Video Converter
4Videosoft Mobile Video Converter
4Videosoft BlackBerry Video Converter
4Videosoft Archos Video Converter
4Videosoft iRiver Video Converter
4Videosoft Walkman Video Converter
4Videosoft Sony XPERIA Video Converter

Do you want know how to put videos on your portable palers? Go to this website to find useful informations, such as How to put video on your iPod? / How to put video on PSP? / How to convert video files for Creative Zen? ...

4Videosoft Products Guide

Hope more people to enjoy 4videosoft.
4Videosoft Sansa Video Converter
4Videosoft Mobile Video Converter
4Videosoft BlackBerry Video Converter
4Videosoft Archos Video Converter
4Videosoft iRiver Video Converter
4Videosoft Walkman Video Converter
4Videosoft Sony XPERIA Video Converter

For DVD fans:

4Videosoft DVD Ripper Platinum
4Videosoft DVD to Palm Converter
4Videosoft DVD to Zune Converter
4Videosoft DVD to PSP Converter

4Videosoft Archos Video Converter
4Videosoft iRiver Video Converter
4Videosoft Walkman Video Converter
4Videosoft Sony XPERIA Video Converter

I recommend you a nice tool to deal with your ipnone ringtone. It can convert MP3 to iPhone Ringtone, even convert any video/audio to iPhone M4R Ringtone, including 3GP, AVI, MKV, RM, MOV, XviD,MPEG, WMV, DivX, MP4, H.264/AVC, AVCHD, WMA, WAV, RA, M4A, MP3 to M4R iPhone ringtone. Most pleasantly, you can put the converted M4R Ringtone on the iPhone directly without iTunes.

4Videosoft iPhone Ringtone Maker

Hi, friend, if you like video and dvd tools, why don't you go to this website to have a see. There are lots of practical tools for all portable players.
4Videosoft Video Converter Tools, Best Video Converter, DVD Ripper, Video Converter for Mac

I recommend some nice dvd tools here：

4Videosoft DVD to iPod Converter

4Videosoft DVD to iPhone Converter

4Videosoft DVD Ripper Platinum

Share some useful tools here:
4Videosoft Palm Video Converter
4Videosoft iPod Video Converter
4Videosoft DVD Ripper Platinum
4Videosoft Video Converter Platinum

If anyone had used 4videosoft, please share your experience and problems here, I will give you a satisfied answer for all you problem as soon as possible. At the same time, you can contract me through email.