I believe the MRSA-like infections you're thinking of are the Gram-negative bacteria [1] mentioned in the article. Based on the Wikipedia page for phage therapy [2], it should be an effective treatment option where the bacteria have polysacharride layer in the cell envelope, which most antibiotics cannot penetrate. There's more in the treatment section [3], which doesn't mention phage therapy however.

[1]: http://en.wikipedia.org/wiki/Gram-negative_bacteria [2]: http://en.wikipedia.org/wiki/Phage_therapy [3]: http://en.wikipedia.org/wiki/Gram-negative_bacteria#Medical_...