LJArchive
Just in case you didn't know, LJArchive is a windows application that can back up an LJ type journal or community (you have to own the journal or be a member of the community though). It runs under Microsoft's .NET Framework (you have to have at least .NET 1.1 installed) and acts as a browser for downloaded and backed-up comments.
It backs up the text of the entries only, not any image or youtube files that might appear in those entries, though the coding is still intact and if either is still on the web it'll show them with the entry. You can also backup comments to entries as well.
The current version doesn't back up tags, but the search function (see screenshot above) works on a text basis and can quickly identify old posts if you can remember what you were talking about. There's also statistics and such like.
As a number of my LJ friends have either left LJ, or considering leaving leaving, I thought that this might be useful in backing up what you wrote, or read. So, Linux users (like rashelleym) want to post a comment with a link to a Linux equivalent?