THe easiest way is the wizard that comes up right after a clean install of OS X (or first boot).
If that's not an option, use Target disk mode (requires a firewire cable between both Macs). And copy over the files you need.
for safari bookmarks, just open safari, go to File -> Export bookmarks. Then copy that file over, and on the new Mac, File -> Import Bookmarks.
For iTunes, copy your entire iTunes Music folder.