There is endless sea of books, but exactly for gaining interest I would recommend exactly Heinlein juvies like Have Spacesuit, will travel and Between Planets. What I also read as a boy and loved it (read it many times over) are 2 books by english juvie author Monica Hughes. Monica Hughes "Crisis on Conshelf Ten" Monica Hughes "Earthdark". Adventures and troubles of boy from lunar colony visiting freakishly heavy gravity mother Earth. In some way it resembles SF movie Zenon, Girl of the 21st Century, only hero is boy, not a girl.

I have more and more nagging thought. With all those absurdities about copyright and latest changes, It would be nice to give some insight to unaware people, how stupid it is by launching really stupid case. Find some author and with help of some good lawyer launch suit against some public library. Reason - they are thieves by sharing my book without paying me for every use. I have similar rights to my book as in case of music and movies. Its my property. How they dare to share it? :) Ufikus from czech republic (means I am not sure, if your libraries dont have some exception from copyright law.