OWNT? Copyright infringment? Hardly. Timbaland knows beats, and the original song has a nice beat, but terrible melody. The only thing simlar about those two songs is the beat. The instruments, melody, and lyrics are different.
And about the beat being the same, there are only so many beats that please the human ear. There are thousands upon thousands of songs out there that have the same bpm. You could lay them over top of eachother and you'd hardly tell the difference. Pretty much any good musician can replicate someone elses beat almost exactly, too.
I think a democrat made those videos.
EDIT: I'll vouch for the ringtone, since you can hear the original 8-bit sounds in the background of Timbaland's tone, but I believe Nelly's song to be different enough not to need legal action.