I asked my 9 yo son, here said: "Laser Tag totaly rocks, can I have one?"
so is he getting one?
I don't know if this is too late but:
(1) Legos
(2) Magnets - they've got some REALLY cool ones now that boys especially like. Try these:http://www.cyberguys.com/templates/searchdetail.asp?s=SD&T1=250+0680
(3) Or something like this:http://www.amazon.com/exec/obidos/tg/detail/-/B0001NE2AK/qid=1131775996/sr=8-1/ref=pd_bbs_1/102-8019304-7410524?v=glance&s=videogames&n=507846
Think gadgety and cool and most boys will like it. Try the Discovery Store (if you have one in your area) for more ideas.