Hi folks,
Thanks for the answers so far.
Found this:
http://support.apple.com/kb/ht1495
I am following method #3 but I think I will leave wife's account always signed on iTunes. I barely sync mine anyway. Wanted to share the link though, in case someone else is interested.
Happily surprised with the overall performance of the MacBook air. The SSD really helps a lot when running out of RAM or doing paging. I noticed min or no lag when heavily loaded. Sync my HP corporate emails with MS Office was a breeze! Still doing some testing but I think I will keep it. I have no SD card port though, not for the 11", which is the model I bought, bummer! I will have to use a USB SD card adapter I have.