I think as much as you want....... But not all at the same time of course :P
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There's no Ipods which does not work with the new Itunes. However future versions of Itunes may
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I'm pretty sure you can add as many as you want
You do not Jailbreak iTunes; you jailbreak iPods and iPhones.
Yes, iTunes version 9.2 works with all current iPods.
you can only use itunes on ipods
Make sure the "Manually manage music and videos" check box IS CHECKED on both of your ipods. This will take a little more work but then it will not automatically sync and will easily allow you to connect multiple ipods to one itunes - we have three ipods and one itunes at our place.
No, iTunes works exclusively for the iPods.
there were no ipods before itunes, i dont think so i remember when the first Ipod came out and i havent even heard of an "Itunes" it was back in 2003-2004 i believe??
No, you can run iTunes on your Mac or Windows computer even if you do not have an ipod.
Yes, you can have to iPods of any kind on one iTunes account.