So far, there has been a presentation and now a paper reporting results with Vivo-Morpholinos in mice.

The paper reports delivery in transgenic mice with an EGFP splice-reporter system:
Li YF, Morcos PA. Design and Synthesis of Dendritic Molecular Transporter that Achieves Efficient in Vivo Delivery of Morpholino Antisense Oligo. Bioconjug Chem. 2008 Jun 20. [Epub ahead of print]

The presentation described the use of Vivo-Morpholinos in mdx mice, a mouse model of Duchenne muscular dystrophy:
Wu B, Li Y, Morcos PA, Doran TJ, Lu P, Lu QL. Restoration of Dystrophin Expression in Skeletal and Cardiac Muscle by Systemic Delivery of MorpholinoE23-Vivo Porter Oligonucleotide. 2008. Abstract 433, Annual Meeting of American Society of Gene Therapy, Boston, MA USA.