First tips.

Using a gamma of 1.8 for your colour profile makes the Finder much more pleasing to the eye imo. Be aware that it will cause disparities with Windows users who use gamma 2.2.

XMenu (freeware) is a potential replacement for those who used to use the docked folders heirarchic menus. (Stacks still sucks!!!)

Data detectors are awesome. Select an address in Mail (and probably other apps) and right click to convert all the details Leopard can find into a contact.

Add to the list.

To show a folder in a stack instead of the first item;

Go to the finder window of the stack. Create a new folder and add any icon you like for it, say you want to change the downloads stack to show the folder instead of the first item, so steal the icon from the actual downloads folder and use it for the new folder. Name the new folder anything you like...lets say 'Downloads' but here is the trick...put a space in front of the D. So you have (with a space instead of an underscore); '_Downloads'.

Your problem is solved until Apple fixes this

If your mouse is a bit flickery and jumps occasionally, check what kernel task is doing in Activity Monitor.

With my Logitech G7 plugged into my keyboard I was able to hit 25%+ by waggling my mouse around. Plugging directly into the machine it's now under 5%.

Not sure why it's so high. I suspect there's something funny between Logitech and OS native drivers.

If you click and hold the mouse down on a window and control arrow to another space it takes the window with it.

And you can do Spaces and Expose all at once.

Using the numeric enter key to rename files - it no longer automatically highlights the entire filename and extension - just the filename - this allows you to rename things easier without having worry about changing the extension accidentally.

Cool, it's about bloody time!

If you drag any window to the edge of your screen (left, right, top or bottom) you can drag it to the adjoining space.

Found this by accident but then saw it listed under shortcuts in the Help file.

Using Expose in Spaces is very handy. Someone suggested using the side-scroll buttons on mice for spaces, which I've adopted.

If you hadn't seen it, in the Finder in the View menu is "Show Path Bar" which shows the path at the bottom of all Finder windows.

Don't forget you can now change the grid spacing in the Finder finally, so the Desktop icons don't have to be a mile from the right edge of the screen.

Don't forget to have Time Machine ignore EyeTV files, bittorrent downloads and the like, otherwise you'll end up doing crazy stuff like using 100Gb a day in your Time Machine HD.

Those sideways scroll buttons on mice just gained a whole pile of friendliness with coverflow.

I don't like coverflow view, but you're right.

It's great isnt it!

Just found this one (not sure if this was in Tiger or not);

On the bottom of the dock, where the crossing bit is near stacks, click this with your mouse and drag it to resize the dock without going into System Preferences!

That was in Tiger but it's a lot easier to hit in Leopard. It still suffers from the same "drag up and down to stretch it side to side" problem as in previous versions.

Just curious, what do they do in coverflow, that the conventional up/down scroll wheel don't?