Firefox with Greasemonkey: The Gmail Addons Greasemonkey script embeds any page you specify inside Gmail's interface. By default, it comes with Google Calendar and the Google Talk gadget. (If this sounds familiar, it is—Gmail Addons is an update to the previously mentioned Enhance Gmail script.) Add any other web pages to Gmail by following the directions on the script homepage. If you're willing to dig into manually editing the script, Gmail Addons can embed Google Reader, Notebook, Docs, Remember the Milk, or virtually any other web page you'd like next to or below your inbox. Gmail Addons is free, requires the Greasemonkey extension to run.

Firefox with Greasemonkey: The FriendFeed by Service Greasemonkey script does just what it sounds like, filtering results in your FriendFeed by service. The one pervasive concern lodged against FriendFeed when we reviewed it earlier this week is that FriendFeed introduces too much overflow with its all-in-one stream. With the FriendFeed by Service script installed, you can filter your feeds by service so you can see at a glance, for example, what music your friends are into on Last.fm or what bookmarks they made in Del.icio.us. FriendFeed by Service is free, requires Firefox with Greasemonkey.

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Firefox with Greasemonkey: Google Reader Filter is a free Greasemonkey user script that takes a list of user-defined keywords and automatically highlights any items in Google Reader whose contents match any word in your matchlist. The script's filtering does not remove posts from Reader, so you won't miss any content—you'll just have your attention drawn more closely to the matching items with the highlighting (though clearly a toggle option to truly filter matches would be useful). Google Reader Filter is free to install, requires Firefox with the Greasemonkey extension. I had mixed results with it, so let's hear how it works for you in the comments.

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Firefox with Greasemonkey only: The YouTube H.264 user script adds a link to view and download the higher-quality version of YouTube videos in page. You already know how to hack YouTube URLs to access a higher resolution and audio quality version of a clip, and this script makes downloading the HQ version easy. (See the difference between regular and HQ videos.) Be warned: This script can take time to render the links (sometimes it hangs indefinitely), and the HQ version isn't available for all videos. Once the kinks get ironed out, I'll add it to the Better YouTube extension. The YouTube H.264 user script is a free download that works with Firefox and the Greasemonkey extension.

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Firefox with Greasemonkey: The Writing Room 4 Google Documents Greasemonkey script makes it possible to toggle and hide the logo and whitespace above the functional toolbar on a writing and editing page in Google Documents. Those with smaller screens and lesser resolutions will appreciate the extra writing space this little script grants them, but it could help anyone looking for a more distraction-free screen—especially combined with Firefox's full-screen mode. The toolbar toggle doesn't work with spreadsheets or slideshow editing, but an intrepid JavaScript hacker can probably fix that in a few minutes. Writing Room 4 Google Documents is a free download, requires Firefox with Greasemonkey (or Safari with Greasekit) to use.