I just had a need to pull out TRANSTYPE. This useful utility comes in handy when working on a design project and getting client-provided materials? Oftentimes fonts come over (which is great), except they are for the wrong platform (which isn't so great). Instead of rushing out to buy the font again, you can usually convert it.
This shareware application converts Mac fonts to PC fonts, or vice versa. Simple in concept, clean in execution--this tool has been a lifesaver that has kept many a graphics project on track.