Hey just a few things to say about the newest operating system Leopard. With the new coll stuff added such as spaces, time machine and boot camp. With spaces, press f8 (the default key) which will show you the spaces you have active. If you have several things spread out over different spaces simply press c when viewing them all and it brings all the windows into one space. You can revert this by pressing c again.
Also when opening a zip, gzip, or other compressed files on an unwritable volume such as a CD or read-only disk image. Instead of giving you an error (as happened in 10.4) saying "Volume is not writable," 10.5 will expand the archive into your Downloads folder. You can easily find this download folder on your dock now.