Now that multimedia mobile phones nowadays support playing high resolution videos, nothing can stop you converting all the videos in your PC. For this you just need a program like Mobiola Video Studio
From Mobiola Video Studio you can convert the videos from YouTube, DVD, Metacafe, Google Video, WMV, AVI, etc. It supports working with the following formats: 3GP, MOV, AVI, MPEG, MP4, MKV, FLV, WVE, UV2, 3G2, ASF, etc.
By default Mobiola Video Studio is configured for the following types of device: BlackBerry, Windows Mobile, Symbian, Java phones, Palm OS, Sony PSP, Android, iPhone, iPod, etc.