Colors deleted Livejournal usernames red. (Obsolete as of August 2008, when LJ reverted the display of deleted and suspended usernames from a non-hyperlinked bold font to a struck-through and clickable state. http://community.livejournal.com/lj_releases/38062.html )
Hides the sidebar because it takes up too much screen space for me, especially in Vertigo. I actually do like having the sidebar around though, so I wrote a Greasemonkey script that will move the sidebar to the top: http://userscripts.org/scripts/show/11244. I'd recommend using this CSS in Stylish in conjunction with that script -- this in Stylish to avoid flickering (because it doesn't have to wait until all page content is loaded to be applied), and then the Greasemonkey script to get the links on top.
Changes visited link color to red, for links in comment threads only, so you can see at a glance where in a thread you've left off. (If you want to make all visited links on livejournal red, change "a[href *='thread']:visited" to "body a:visited" in the code.)
In the Livejournal contextual hover menu, removes the "Add friend", "Remove friend", "Watch Community", "Stop Watching", "Join Community", "Leave", "Ban user", and "Send a virtual gift" links. Update 01-30-09: The "Ban user" link is removed. Update 10-05-08: The "Send a virtual gift" link is removed. Update 11-14-07: The "Send message" link is not removed.
This is a style to recreate the style of the LiveJournal site that was present during Halloween 2007. Note that this style will NOT do anything on its own; it requires the 'LJ Skins: Class Adder' script from userscripts.org to work as LJ does not yet allow easy identification of site schemed pages. This script can be found at http://userscripts.org/scripts/show/10190 ; please see that link for more information on the script itself. For more skins like this, check out the 'ljskins' community on LiveJournal: http://community.livejournal.com/ljskins/
So I can see all LiveJournal pages in my own style.
Removing any ads on livejournal.com (also ads in profile & start page) author: http://moosatov.livejournal.com/
ETA December 20, 2008: I've completely revamped this script to work with the latest changes to the profile page. What this script does: - changes the font family to Verdana on the whole page - removes the blue bars completely - changes the font colour of the section headers to match the blue of Horizon/Vertigo - adds left- and righthand margins both to the whole page and to each section - changes the colour of visited links to provide a bit more contrast with unvisited ones - reinstates underlining for the links in the Interest, Friends, Communities, and Feeds sections - removes the unnecessary text from the tool/action bar - moves the default usericon to the right side of the text - makes the font size of the title and subtitle a bit larger - mades the font size of the stats a little bit larger and changes the font colour to black - makes the font size of the tags, memories etc stats a bit smaller - adds some padding in this whole section to make it look less cramped
Removes LoudTwitter entries
For default style. Affects also other styles.