lselect is a really handy Finder toolbar addition. It lets you select files, in Finder, using globs, just as you would on the command line. On the lselect page, if you download the "lselect-toolbar-app.zip", expand that somewhere (e.g. where they suggest on the web page), then drag it up to your Finder's toolbar to add it. Now, wherever you are in Finder, if you click this new toolbar button, it'll show you a dialog that lets you type in a glob pattern, and will then select all the files in your current location based on that glob. Pretty slick.