Here's a Greasemonkey script I wrote. It is squarely in the "guerilla UI improvement" camp, and is for the LiveJournal "Edit Custom Friends Groups" page. It adds the standard account type icons to the user lists, like this:

The icons really add to the legibility of the page, as you'll find your groups rarely have syndicated or community accounts (unless you use groups to categorize for reading; access control friends groups will be full of real users). I think my implementation is fairly clever, in that it uses XMLHttpRequest to pull down the regular Edit Friends page to find the icon to use. I should've gone ahead and made it look for strikethroughs so it could also mark deleted accounts in the lists, but I cocked this up in an hour and only touched it once since (to remove some debugging alerts I had left in my installed copy, and to make it disable the group selector until it fetches the Edit Friends page--otherwise it can't categorize the users right).
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Nifty script. A few comments.
1) It’s XHTML, use XPath to query it. 2) You should probably combine all those addGlobalStyle calls into one, then inline the function. 3) A lot of greasemonkey scripts I’ve seen start with “function () {“, possibly for namespace issues… 4) When hooking functions, use lexical closures instead of storing on window, it’s way safer.
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Zomg! I have founded you! Your map is ONLY the hottest thing going at LL! Awesome! I had fun with you guys there. :)
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Aie. :o It was very fun, yes!
I put all my in-world snaps here btw.