Keys needs to be very responsive (laptop keyboard type keys), needs to be durable (cheaper plastic keyboards doesn't last long with me, maybe 3-6 months, Microsoft keyboards typically lasted the longest of the plastic keyboards) and it needs to have a low profile (as flat as possible so that my wrists don't touch the keyboard).
Been using the Apple wireless keyboard for quite some time, destroyed one of them so far (keys IOPJKLNM< all died), other two are still going strong after 3 years.
