Unteins from the WordPress forums has come up with a way to use LJ tags in your WordPress blogs. From his post on the forums:
If you’d like to be able to use LJ User tags in your WordPress Blog, do this.
Download this file and save it in your WordPress root as wp-ljtags.php
Then add these lines to you my-hacks.php file and make sure hacks are on.
//WP LJ User Tage Parser
This works really nicely with the Auto Update hack which let’s you post to your Word Press blog and LJ at the same time. Check out my additions to that hack as well.
You can find his blog at G.B.A.A.O.