The first is an extraordinary CGI visualization of the internal biomolecular activities of a white blood cell, entitled "The Inner Life of the Cell":
The depictions of the transcription of mRNA into proteins and of vesicles "walking" along microtubules via motor proteins are particularly fascinating. This video has garnered a great deal of interest of late, both in the educational community, and in Hollywood. Have a gander at the Wired article.
The second is a startling bit of micro-cinematography of the real thing, made possible by the use of fluorescent-tagged proteins: