Paul Wright's software
Here's some software I wrote.
You can read more about it on my my LiveJournal entry about it (which is also the right place to post questions or comments about it), and download it from the userscripts.org repository.
A Python script which posts entries from a link blog (for example, Delicious) to LiveJournal, batching up many links into a single LiveJournal entry. Written for my use, but could be adapted if you're OK with a bit of programming. More details here
URLBody is an extension for the Spampal spam filter, which filters out spam based on the links in the body of messages. I no longer have a machine which can run Windows, so I'm not maintaining it any more, but it works well enough that there's not really any need for further changes. Read about it on the SourceForge site for it.