I don’t know whether this trick has already been mentioned:
In the Finder, in List view, you can navigate using the up/down arrow keys. Now that’s well known. If the selection highlights a folder, pressing the right arrow key expands the folder (same as clicking on the “open” triangle symbol on the left side of the folders name).
Pressing the left arrow key collapses the folder again. If the selection highlights a document in an expanded folder, pressing the left arrow key moves the selection up to the containing folder, which then can be collapsed by pressing the left arrow key a 2nd time.
This isn’t a leopard trick, but it’s a good one never the less, and I’m posting it because someone made comment that the site can be a little hard to read due to the text size. Not everyone has superman eye-sight!
So here it is. Whilst in Safari, press “cmd +”. Thats the Apple key, and the plus/equals key next to the “delete” key. Try it. Pressing the minus key “-” will decrease the text size.
I actually use this feature on my kitchen mac when cooking off a recipe I’ve found on the internet. Easier to see when I’m on the other side of the kitchen!