You can watch it here and other Obama videos:

Full video & transcript of Barack Obama's Berlin Speech without ads or logo's.

Full video and transcript of  with Barack Obama's Speech on Race without ads or logos:

The 'Yes we can song' by will.i.am full original video and lyrics:

If you want to download the Berlin speech you can do that with Firefox and the DownloadHelper extension:
Click here and use DownloadHelper to download it. With this extension you can download flash (*.flv) videos from many sites like YouTube.