Create a folder containing your current selection by choosing File > New Folder with Selection or by pressing Control-Command-N (⌃⌘N).
Handy as hell.
OS X Lion will be available on the Mac App Store tomorrow. This image illustrates a feature worth at least $29. Make sure you edit Mail’s toolbar and drag that button in.
It does the right thing - if there’s a folder called Archive, it puts the email there; if not, it creates the folder first.
This just in from the Department of Who Knew? You can resize multiple point sizes of text in Mac OS X by using mathematical equivalents in that little box just under “Size”. In other words, if you select multiple items of different sizes and want to triple the size of all, just type *3 (times 3) and hit return. Other functions ( / divide, + add, – subtract) work as well.
Finder allows you to specify a default search location when using the built-in search tool at the top right of any Finder window. Your choices are “Search This Mac” (the default, which seems to annoy most users), “Search the Current Folder” (which is what I’ve always wanted), and the verbose “Use the Previous Search Scope.” This option is under Finder > Preferences > Advanced, and I believe it arrived in 10.6 Snow Leopard.