I wanted to follow up as I've purchased the Illuminator dictionary for Mac OS X. I'm on a late 2011 MacBook Pro (Intel chips). I'm on OS 10.7.
The dictionary comes with the dictionary files themselves, a TibetDReader program. The installation isn't difficult. But the TibetDReader in the applications folder, put the dictionaries in another folder. There's no special emulation software to run, as the program just runs. You have to point the program to the dictionaries folder, then set the text formatting based on the fonts you select for the English and Tibetan scripts. For some unknown reason, the software did not display the Unicode Tibetan fonts that I have on my machine (Xenotype Drepung, Woodblock, and Tibetan New) in it's list, nor even the preinstalled Kailasa and Kokonor Tibetan fonts supplied by Apple. I had to go find the Microsoft Himalaya font on the web and install that.
The TibetDReader is used to display the dictionary. It is a PC port and has just the barest minimum to get to be a Mac program. There's a couple little bugs, such as the hyperlinks don't work on a page that's been scrolled, and the "back" through entries that you've looked at seems to have an "off by one error". But the functionality is sufficient to search and find the words you're looking for. Sometimes the program takes a bit to load a long entry. So it's an opportunity to practice patience.
The dictionary entries themselves are truly excellent. Verbs have all the tenses, the parts of speech are clearly indicated. Words that can be used in different ways (verb, noun, etc) are properly displayed so you can see their usage. Entries often have descriptions of their colloquial usage where appropriate, or the specialized meanings that crop up in practice usage, or for meditation (eg specific Dzogchen and Mahamudra meanings), or how the word is used in the philosophical texts. The description of the meaning really says what it means, and not just a list of possible English translations. Knowing the real sense of the word let's you decide how to properly phrase something in English.
There's a decent amount of front matter with a long list of references, works cited, abbreviations clearly identified, and descriptions of Tibetan grammar and verb theory. This is another really excellent part of the dictionary. It describes the Tibetan parts of speech and how the connectors/assistives (called particles in other books) really work without burdening the language into being Sanskrit or shoehorning it into a English model. I haven't ordered Lama Tony Duff's books on Tibetan grammar but the info here seems to be a foretaste of those. I can see those being very useful to anyone wishing to learn Tibetan and I'll get them once I finish paying off my US income taxes.
I would recommend the Illuminator dictionary to anyone working in the Tibetan language and am glad I have it.