We're on a Windows 7 Preview screencast bender! You've already seen Windows 7's Aero Shake and Peek features today, but another useful drag-and-dropper is the ability to resize any window to half the size of your monitor and dock it to the left or right side of the screen. In an earlier screencast you saw that dragging a window to the top of the screen maximises it. Following that, if you drag a window all the way to the left or the right of the screen, Windows 7 will display a glass overlay. Let go of the mouse button and it will snap the window onto that overlay, which is half the screen's size—a handy helper for widescreen monitor owners. Hit the play button above to see this in action—apologies for not including the half-siz docking action in the earlier clip.

Discovered a fun little feature in Yahoo Mail this week that made me wish for the same in Gmail: the Subject-O-Matique, a random subject line inserter. When you just can't think of the right subject for your message, click the subject button in the new version of Yahoo Mail to automatically fill in something cheeky or goofy. Hit the play button above to see some examples. The closest Gmail's got to this is its random signature experimental feature.

Now that you've minimised Firefox's chrome with a few good user styles, it's time to maximize your surfing area. Just by moving a few small things around you can have all of Firefox's menu and location bar's features, but without all the real estate-hogging. Check out a video screencast of how to consolidate Firefox's chrome after the jump.