If you want to watch your favorite YouTube or video clips on a portable device, then you'll have to convert them into a suitable format first.
Aimersoft Video Converter for Mac is a powerful Video Converter that will convert videos on to iPod, iPhone, PSP and Zune formats. It supports a huge range of input sources including MKV, WMV, MP4, MOV, M4V, AVI, FLV, 3GP, 3GPP, MPG, VOB, DAT, ASF and HD video etc. However, the output formats are notably more limited to MP4, AVI, MOV, MKV, M4V, FLV, 3GP, 3GPP, MPG and ASF.
The nice thing about Aimersoft Video Converter though is that it even allows you to trim clips to your needs. If you want to capture a part of your clip, you can simply define a Start and End Time by dragging the start and end slider to the appropriate position. This is particularly useful for removing ads or black slides that interrupt it. Add to this features such as a stills capture tool and batch converter, and you've got yourself quite a compact but comprehensive video conversion and trimming tool.
Aimersoft Video Converter is an excellent tool for anyone that wants to convert just about any format to work on their iPhone, iPod, Zune or PSP.