Hey I got a macbook back in october and this has been happening every day and im starting to get sick of it. I'll be online, then right out of no where a page wont load. I have to run to my basement and reset the wireless router, wait 30 seconds, then it works again. I know for a fact that this isnt a router problem, because I can use my ipod touch, imac, ibook, and ps3 with wireless and wired connections with no problem or connections dropping. I searched and it seems like this is only a problem with the 10.5 update, so I dont know whats wrong.