Re: Work in Switzerland but live in France
I beleive that as a UN worker, you wont pay income tax anywhere, which is nice!
You do still have to register with the tax authorities in France, and you will have to pay the yearly "tax d'habitation" this is based on the size of your house and the number of inhabitants, but rarely comes out at more than 1000euros per year, so not a big worry.
You may need to check with the US authorities what the rules are for having to pay income tax while liveing in France and workign in Switzerland, I have seen peopel hit with big retroactive tax bills from the US!
As for your husband, he can work in Switzerland ok, he will have to register as a "frontalier" and will pay some measure of his taxes in both countries, this is such a standard thing in the area that he rules are all in place and he will get taxed "a la source" meaning he will be taxed each payycheck (monthly) so its a lot less hastle!
The only problems to be aware of are that he may find it difficult to get work in Geneva, as to get a work permit, the company has to prove it needs him specifically, and prove why they need him over a Swiss person. and then why they need him over a European, as there is an agreement between Switzerland and Europe on work permits, but for Candians it is more difficult to get a permit.
I suggest he looks at the international organisations first for work (UN, WHO, Cern etc), or at the large corporations with headquarters in Geneva: proctor and Gamble, JTI, cargill etc, it depends on what his line of work is.
Another good hint is, try at the expat bars in town for a bar job! sound silly, but they have a good excuse why they need native English speakers, and so can get permits easier, they in fact pay well enough, and are fun and a good way to meet people in town! the added advantage being that he will then have a work permit, and find it a lot easier to get other jobs.
Good luck/Bonne chance!