I've been running Leopard for about two weeks or so now. It has not been the usual OS update where it has some nice eye candy improvements and some underpinning changes, but doesn't essentially affect the apps I run. Leopard has directly impacted the apps I run. There are also some that I've chosen not to switch to.
But first, wow, the little printed booklet that comes with Leopard... wow, a) I actually read it, and b) the info in it was actually useful! Hath hell froze over?! Printed documentation of value?! Woah nelly! Even better, it was short, easy to read, and to the point, with almost zero fluff. Way to go Apple.
The app changes...
Not a lot, but a couple key ones. As I mentioned in a previous post, I am no longer using Path Finder, because regular Finder has some great improvements, picks up some of the key features I used Path Finder for, and it eliminates needing an additional app, that didn't integrate as seamlessly as you'd hope.
Update (12 Nov 2007): A new version of Path Finder has been released that integrates MUCH better with Leopard, including supporting Quick View, and having an "Open in Finder" replacement that works completely. I'll have to see if I go back again to using Path Finder...
Second is iChat. The jury is still out on this one to be honest, but the fact that you can now login to multiple accounts on a single network (Jabber for me), all the video and screen sharing enhancements, and again, one less app to install and keep up to date, has led me to stop using Adium for now. We'll see. I've tried before, and iChat was not up to par, but this time it's looking like a replacement.
Other bits... Stacks are pretty cool, especially when you add overlays to keep them straight. Quick View rocks. Safari is definitely better, and thankfully the one feature Safari cannot seem to implement, for who knows what reason, is still solved by Saft. This is the feature of it remembering all the tabs you had open when you close the browser, and re-opening it with that. Saft also adds a great feature, which is to allow you to edit Text Area's with your favorite editor. This is key for me (I use(d) a similar plugin with Firefox).
What hasn't changed...
Time Machine. Yep, I am not a convert. Admittedly I haven't looked at every option, etc., but I'm a Super Duper! fan. Why? First I don't really need multiple revisions of files - any files I do need that for are already in a version control system. Second, one of the key features of Super Duper (or similar) backups, is that I have a complete clone of my drive, that I can boot off of. This has saved me a few times. What happens if your hard drive goes bad or something happens to your system. Fine, you restore from backup. But, what if you are in a time bind and you really need access to your files? Well, you can just boot off your backup, work there for a short bit, and then perform your restore/redo when time permits. No biggy. Yes, you lose whatever was changed between the time you did you clone backup and the current time, but for me that is often very little (due to what really matters being in version control, or being backed up by Jungle Disk every 15 minutes).
I still don't use Apple Mail. In fact, these days I don't use a desktop mail program, or rather, one that I POP or IMAP mail with. I use Mailplane, and all my email accounts are Gmail accounts (I have a half dozen or more at this point). Works extremely well for me.