My LJ post bookmarklet launches a LiveJournal post form that contains current url+title+selected-text (so it's more fun if you select some text).

The content is formatted the way I like it:

Hope you like this format too, but here's the JS in a more readable form in case you want to modify it (should be in a single line, of course).

javascript:d=document;t=d.selection?d.selection.createRange().text:d.getSelection();
           void(window.open('http://www.livejournal.com/update.bml?mode=full&event='+
                            escape('%3ca%20target%3d%22_blank%22%20href%3d%22'+
                                   d.location.href+'%22%3e'+d.title+
                                   '%3c/a%3e%3csmall%3e%3cblockquote%3e'+t+
                                   '%3c/blockquote%3e%3c/small%3e'))

Based on Gary Mort's code.

changed September 14, 2008