Two suggestions 1st) Take a look at the PPM-Repository package it will allow you to add almost every repository out there, well depending on your version of PPM ( there is a bug that the Author hasn't fixed yet to auto add them ), then search again. 2nd) I would google it and search for the .ppd this should turn up sites that have the ppm for you to install from.
I believe that I have every major PPM repository added, and a search of them all doesn't turn up a PPM for I::M.
Update: That is, not for 5.8.x. It appears to be available for 5.6.x.
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