Press Command+N to open up a new finder window. Right click in the blank space (I right clicked under my iPod) and select "get info." It shows your computer info.
Or just click on "Tyler's ComputeR" but whatever your name is and select get info.
Command+N opens a new window in any application, I don't think its hidden. But that get info thing is like the "about this mac" in the Apple Menu
So much for good design
As you may have guessed, I don't keep it in the dock.
So did you get it to work?
Wow, just discovered it while reading another thread!
Try opening a website (this thread should work) and with nothing selected, do Cmd+I It sends the html with Mail.
I know it's not a "hidden" feature, but it can come handy.
Wow, and it even reads the <div> tags!!! (if you know what that is), so you can select sections of the page.
You can Spotlight it too. Just hit Cmd-Space, the type in "ti" or "tim" and it should be the default result. As long as you're in one of those apps, it'll still do the same thing.
While trying one of these commands, I found another one by accident (hit the wrong key). It's probably been around a while, but Cmd-Shift-Y while on a picture or text file will create a new Sticky in the Stickies program with the contents of that file.
jW
I find things on accident as well

. That one was mentioned, not sure how its useful though

.
Great thread, I've picked up a few handy tips already.
cheers.
Wow! This is an incredible thread! Really ought to be stickied to help
switchers and long time users alike.
Yeah, I thought it would be a great idea, ive learned A LOT!!!!
Where you get them? Just experimenting with the keyboard and clicking everywhere or you use a book or the mac help?
For me, I found them on accident, or I wish that if i do this keystroke, it does what i want it to do, and incidentally, it works.
1. Try clicking Shift+minimize button ---> Slow motion minimizing.

It's soo cool!
2.
Select widget in dashboard then click cmd+R ----> Very cool widget refresh!
Not very useful, but I like it!
not sure if its a refresh, but i like it!!!!!
Ups sorry, this one is only Leopard for sure:
Shift+click on the stack---> opens in slow motion.
Same as for everything, Shift minimize puts it in slow motion, just play around, click different things with Shift.
I just discovered this one a few days ago (I even reported it to TUAW and I was "blogged"!). . .
In the spaces preferences pane, you can drag an app from finder to the "diagram" of the space to which you want it to be assigned, and the app will be assigned to that space.
Before, I was just using the "+" below the application list to add an app to assign an app to spaces.
THANK GOD. Those + & - buttons are killing me, i hate them, this ought to be MUCH easier.
I like that one, but reverted it back to the original
This one I recently found out. In Finder, select multiple images and option-click on the QuickLook button. It automatically creates a slideshow of the selected images.
Yeah, and you get an index sheet:
Found another one, but I don't think its hidden. while in a text box anywhere, word processor, hold down the Option key and press all the letters on the keyboard, they turn into different symbols, like this:
˙ˆ∫¨©¥†©˙∆¨˙∫¨˙∫¨˙√∫˜˚∆©√†®∂´´å∑´ß≈ƒ©˙∆©˙∆˚¬¨Ô¨Ô¨´Ô´ÎÓÁ´´ˇÓÁÔÔÍÁˇÏÎÔÁˇÓ´ÎÓ„ÁÎÓ
And shift+option gives you even more.