Liches do indeed rock, my favorite way of utilizing magic in the game. But to be honest the style of the unit isn't something to my liking, as opposed to the Angel Knight which I find looks very very cool, sadly they aren't very good at anything really except killing the undead. nonetheless I always had one around just because I liked having one. It's too bad that despite them being much much harder to get than a Lich, they were much less useful.
I remember taking that angel knight you can recruit, leveling her up, then turning her into a sword with that one rare spell and giving it to the main guy. then I got the demon.
Matsuno's been too busy working on Final Fantasy Tactics Advance and Final Fantasy 12 to revisit the Ogre Saga lately - maybe after FFXII is out the door we'll know what his next project is.