I found bywifi at Digg / All News, Videos, & Images
ByWifi lets you search,convert and download any youtube (and they've also added support for metacafe) video(s) from your mobile.It sort of falls into the catagory of "Online Video Converters".But the ability of it to do the all three basic steps, searching, converting and downloading, from your mobile really takes the cake.
It really works!

And now I found a new feature of it. It optimizes my favorite website according to my phone! I really hope you can enjoy it!