Topsie has a very good point, but what he doesn't know is that I am a quadruple virgo, which means that what I want is to do the best job I possibly can -- which in turn is why I have been asking all of you for input.

I have about ten pages of spelling and vocabulary differences collected, relying largely on this Finnish site, which had higher overall quality than any other online resource I was able to locate. Tomorrow I will dig out my Fowler and add to the sparse grammar and punctuation sections.

I am feeling reasonably good about it; mostly I wanted to be sure that there was not one perfect reference work that I should be using but that I hadn't heard of. After asking all of you as well as querying an expat American friend (who as it happens is a linguist) in New Zealand and not getting any answer other than Fowler, I am fairly confident that I'm not overlooking any obvious research resources.

Thank you all very much for your comments! They have helped me tremendously, and it's been grand to watch the discussion grow. I can't tell you how delightful it is to find that there are people out there who are yet more pedantic than I; I hadn't been entirely sure that was possible.

Cheers,
Claire