Just got my PowerBook 15" yesterday. I've done my best to search the forums for answers, but a few questions remain:  In Safari, I've noticed that occassionally I'll open a new bookmark or click on a URL and the page will load in a new window, even though I've got the "open links from application" set to open in "same window" and I've enabled tabbed browsing. I'm used to Firefox which never allowed multiple windows to open.  Since I am used to Firefox, I am curious if there are any disadvantages (i.e. loss of functionality, etc) of using it over Safari on the Mac. I'll probably just download it and give it a try in any event, but it might take me a while to figure out what I might be missing.  I'm dying to get a Bluetooth trackball. From what I've been able to determine, there aren't any except for one by DVForge which is to become available in July (http://www.dvforge.com/theball.shtml).  Can anyone point me to some good URLs I should bookmark for Shareware/Freeware. (I know Download.com has Mac stuff...just wondering what the best Mac sites are)  Any other useful URLs every Mac user should bookmark? That's about it for now....just LOVIN' my Mac!