- Quicklook previews in Stacks and Spotlight, Drag&Drop support in spotlight, Quicklook previews for web pages, addresses, etc. in Mail
This is good, great job Apple
Image
- being Apple to do a Spotlight search for content in "unsaved" documents
Image I don't use Spotlight, Alfred is better.
- not having to worry about apps crashing, since all windows, including "unsaved" documents will automatically be restored
Not exactly...if Photoshop crashes I still lose my progress if it's unsaved. That's the only app I care about.
- having apps restored to their former state after a restart - especially useful when system updates requiring a reboot are released, or when I switch between different operating systems.
NO NO NO. I hate Resume, it lags my Mac like crazy. Having 20+ apps open on startup is not the way to go.
- being able to quit apps without losing open documents or making decisions about saving or not saving changes in documents
I always save it myself, 'cos that's how all other OS work (quit, -do you want to save bla bla?-, yes, no, cancel)
- generally not having to care about whether documents have been saved or not (more or less wysiwyg with regard to the document you see and the corresponding file on disk)
Not really sure what you mean.
- being able to compare parts of a document to other parts from older versions of the file/ being able to copy snippets between different versions back and forth / being able to restore a former version without ever having to manually save or take care of versioning
Only in supported apps, which I don't use much (plus Versions is a fail for me)
- apps like Preview, Quicktime, Textedit and Automator automatically terminating themselves when there are no more windows open (with the process hanging around so that the app can be quickly restarted) -
doesn't really take up that much RAM though...Lion's bloatness is not because of this
- Safari's "Web Content" process automatically terminating itself shortly after there are no more Safari windows open (might be in SL as well) -
I believe it is
- having the last-used documents shown when performing the four-fingered "app exposé" gesture over a Dock icon, regardless of whether the app is running or not (i also use this all the time with the Screen Sharing app to start a VNC session with a particular computer) -
oh wow I didn't know about this, my bad. This is good.
- fullscreen apps for when I want to keep all distractions away
Don't need this.
- hidden scrollbars resulting in a cleaner UI with fewer distractions, and more space for content
Only makes sense on laptop though.
- reversed scroll direction (seems logical and natural to use to me)
Absolutely.........and absolutely not. With a trackpad = YES. With a mouse = NO. This is not a flight simulator.
- multiple desktops with different desktop backgrounds and gestures for switching between them and fullscreen apps
Hyperspaces does this on SL, for the rest, BTTool
- four-finger tapping to switch between the last used desktops or last-used full-screen apps (requires terminal "hack")
- windows that are shown in their correct size relative to each other in MC (unlike in SL's version of Exposé)
But you can get Leopard's Expose on SL...which is relative (I don't like this, personally)
- app icons for easier identification of a set of windows in MC
No birds-eye view, though (birds eye view is when you invoke Spaces then Expose, so you can see EVERY window on your desktop, then you can move/go to that window)
- ability to easily pick out windows of an app with few windows open among apps with many windows open (I always have tons of Safari windows open which makes it harder to find other apps' windows in SL's Exposé) -
this is why you use bird's eye view
- Seamless Full Disk Encryption -
I don't use it, but I'm sure it's a welcome addition.
- swiping to go back and forth in Safari, pinching to zoom in -
I use Firefox, and with BTT, the same effect works with no time wasted on pointless animations.
- pinch out gesture to show the Desktop
Press F11, much quicker and no awkward motion needed.
- Ability to quickly duplicate an open document (I also assigned a keyboard shortcut to the menu entry) -
Save As......? Seriously, Duplicate is terrible compared to save as.
- improved search / search tokens in Mail
It's funny because it's slower to search through my 8000 messages on Lion than SL...maybe it's just me
- Grouping files, especially grouping by type or date, in Finder -
This is amazing. I cringe every time I'm on SL and it doesn't have this. Can't live without it.
- Favorites bar in Mail with keyboard shortcut access to individual folders (Cmd-1/2/3
) -
Don't use it
- Full-screen Preview !! (awesome for distractionless reading as well as annotating PDFs or sorting through pictures) -
I always use my Preview without full-screen, bad habits? haha
- Full-screen screen sharing (why is this only now possible?! )
- Full-screen terminal

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Not really important.
- Resize windows from any side (can't believe how often I use that now Apple was simply wrong about this one before)
They were, but I hardly ever resize windows anymore. BTT -> activate 'Windows 7' window snapping. Done. Now that's something I can't believe Apple never had out of the box.