So here I am, I've been using Leopard for about 24 hours now. Here are some initial impressions...
First, I had problems with my desktop computer. However, I have had problems with it before upgrading. So, I wound up backing up my files and wiping my main drive so that I could do a clean install. It's working great now. I just couldn't see my Windows systems before so that I could connect my printer. I had other small problems too. So...
The upgrade went pretty quickly, about an hour on my MacBook. The clean install only took about 30 minutes. The backup prior to the clean install took over 6 hours.
Speedy: This thing is definitely faster than Tiger. Mail is way faster, Safari feels faster, Dashboard also seems faster.
Finder: I have to say that the finder with it's iTunes sideboard is way better than Tiger's finder. I really love the breadcrumbs at the bottom of the window (turned on via the View menu). I don't really see the point of Cover Flow in the finder. I know everyone says how nice it is to look through documents in Cover Flow, but I find it a little clumsy compared to Icon view with 128pixel icons that are previews of the documents. That and QuickView makes scanning documents really easy.
Time Machine: Absolutely a dream come true for me. I finally have a backup system that will store more than a day's worth of backups. Although I did just recently find out that ChronoSync also will allow you to do incremental backups. I wasn't aware of that in the past. The interface is pretty cool, although you need a pretty high resolution screen in order for it to be useful. Otherwise the window is shrunk down way to small to be useful.
Stacks: I so love stacks! I don't really use it for application launching, but I love it for keeping files I want to use frequently at a clicks distance.
Back to My Mac and Screen Sharing: Man, this has to be the killer app of Leopard. The tricks they use to get screen data sent across the net at ISP speeds is really great. I'm not waiting minutes for windows to animate the way I did before.
Dock: I'm not a big fan of the new Dock. I have switched it to the 2D look for now. My Dock is more of a "what is running" tool than a here are applications you might want to run.
Mail: I'm missing my MailTags big time. I haven't used mail that much other than what I normally use it for. I haven't played a lot with Todo's and Notes yet. I just want my MailTags back.
iCal: The improvements they made there are both great and weird. Editing events in iCal are really weird. But they have really improved the look of it. It's definitely going to take some getting used to.
Safari: I really like the "Open this page in Dashboard" feature where you can create a Dashboard widget of any webpage element. It's really easy to make dashboard widgets of comics now. Other than that, eh.
Help: The help system is pretty different now. I'm not sure it's better, but if you find hits talking about menu items, it points out where they are.
Overall, a pretty nice change. I'm not disappointed. 
written by Dave M.
\\ tags: Backup System, Backups, Breadcrumbs, Chronosync, Dashboard, Desktop Computer, High Resolution, Initial Impressions, iTunes, Killer App, Leopard, Macbook, Mail, Quickview, Resolution Screen, Safari, Sideboard, Stacks, Time Machine, Windows Systems