never having used it, i hope i can answer question 1. it should support any resolution on the external display that the ibook can support ie pretty much up to 1920x1200/1440.
also, it's "muchas gracias" iirc.
The hack's great, I have had no problems with it, and it doesn't seem to slow things down. I was running a 21" monitor at a high resolution (over 1700 at 75hz, sorry not on my iBook at the mo) and it was fine, I would recommend it anyone.