Good ideas mentioned here ! Mouse over or the system stabbey wrote I like both, especially the Mouse over (hover) like you can find on websites !
Too much text in one time isn't good in my opinion, but on the other hand it can start to be (a little bit) annoying when you've to clic clic clic so much times to read all of the dialogs !
So please, don't make the dialogs like a clic-fest !!!
Thanks !
