How to show the Dock while using full-screen apps in Lion
When using a full-screen app in Lion, you can move the mouse to the bottom of the screen, then move it down again to show the Dock.
You can print a document directly from the Finder without having to manually open its parent application. This may seem obvious, but enough folks seemed to not know about it when I asked around.
You simply need to select a document in the Finder and hit ⌘-P, or just select Print from the Finder’s File menu.
The document’s native app will open it and send it to the printer, then promptly close. Third-party apps may require you to manually approve printer settings, but Apple’s own apps (like Preview) will send the job right along its way!
Editor’s note: This seems like one of those clever-but-unsung features that’s been around for a while, perhaps even from the pre-OS X era. Anyone know when exactly it showed up?
One of the problems with Lion’s scroll bars is loss of context for how much content is in the window; unless you pay attention while you scroll, you have no idea and no way to tell where you are in a document. In the Messages beta, Apple provides an example of how developers can handle this loss of context. Just above the text entry area, there’s a clear overlap of the text entry with the content when it is scrolled off the bottom.
As ever, Apple has addressed the details too. The indicator is subtle and fades at the ends. Moreover, when scrolling, the indicator fades in as the first several pixels scroll by. Most users won’t see this, but when scrolling slowly, you see the attention given to this aspect of the experience.
This isn’t a panacea, but it shows that Apple is thinking about some UI issues that are endemic to Lion’s iOS-ification and solving them in new and exciting ways.
For App Store apps, Quick Look shows the purchase date instead of Last Modified.
Nice Lion Touch: Swipe for Dock Exposé
Steve Lyb discovered a handy multi-touch gesture for quickly triggering OS X’s Exposé feature to focus on the open windows of a specific app, instead of all open windows.
iTunes’ rental icon turns red when one of your rentals is about to expire.
Some of Apple’s OS X icons Think Different
The text of “Here’s to the crazy ones” is on the Text Edit icon:

Some of it also appears on the new All My Files icon in Lion:

Safari Reading List maintains scroll position when exiting, re-entering

If you are in the middle of reading a long article in Safari’s new Reader feature (View > Show Reader) and exit to see the original page, you will resume at the same part of the article upon reentering the Reader view.