It is a full-featured LiveJournal client for Windows XP and Vista, using the .NET 3.5 Framework. It is under active development, and has it own community (multilj). It's been in existence for better than a year now, and runs substantially bug-free - what quirks it has are discussed on the download page. At this point, besides the occasional bug fix, the only significant feature that is missing is a photo upload interface.
So what do you think?