I work from home and hate it! I really miss the office scenario and the contact that comes with it. Having said that, I don't really like my job, so that's probably got something to do with it.
Anyway, if you save a lot on commuting and can do a 60:40 split, for example, on your work days, it could be great.
I get bugger all from my (public-sector) employer. Not a bean towards anything. The attitude being, apparently, that we are saving on commuting costs (ignoring the fact that they save on expensive office space!!!). The assumption was that we would be out of the office 70% of the time, whereas I'm home 80+% of the time in reality. I don't like this situation, but won't rock the boat - yet.
You will need a printer. I've got a multi-function device, as the scanner option is useful from time to time. If you can squeeze a fax MFD out of them, it may well be of use occasionally and you'll have that option covered. Try to get a work laptop (You won't want to have your work stuff cluttering up your personal one) and a docking station, if available. It's a pain to have to uncouple USB plugs - laptops usually only have 3 USB ports & I always need 4! If they give you a docking station, ask for a LCD screen. A 19" one at minimum. A cordless keyboard and mouse will be a nice touch and unclutter your desk. Ask for a contribution to your broadband and phone bills. I get neither, though I do get a Blackberry, although I don't like using mobiles for long calls. (sorry this should appear in the Rant thread
)
What security measures will your employer enact on your connection to the office? Check out if this has any implications on your IT set-up. I'm not supposed to use wireless, for example, even though I do. If I didn't, I'd have to run a cable to the room I use as an office.
Finally, if your house is usually empty in the winter, you should also try to get a contribution to your utility bills. Being at home in the daytime will up your bills.
Oh, I forgot; I did get a chair out of my employer. A desk with drawers would be nice, as I don't have that luxury.
That alls sounds like quite a wish list, but all justifiable IMHO.