@pleonasm - I could certainly see that some forms of music have been influenced by spoken poetry and maybe have influenced it in turn, but I think the recent rise of street poetry has more to do with modern forms of media than anything.
People like short snippets of information and entertainment now. They are used to being able to get that through the internet, with the video sharing sites.
So, sitting down and letting people entertain them and inform them with short poems doesn't feel as alien as it might have once been, not for young people anyway. And the poets have an easy method of getting their work out there and getting feedback.
If they are any good, they go viral and if they aren't, their friends and networks can help them to get better.
It's definitely an interesting time for poetry.