Damn. That would suck. According to someone on my lj flist he's awesome at signings. You know Admiral Ar'alani from Outbound Flight? Zahn met a fan named Ari Roselani, who was cosplaying as Thrawn, a few years before he wrote that, and if the wiki is to be believed they became friends. This makes me ridiculously happy.
I've heard good things about the Conqueror's Trilogy, but I haven't seen it yet in bookstores. His Dragon and Occupation books for the YA section were good, but damned if I can actually find them anymore. Particularly the last one, which I haven't actually read.
Eh. I used to like the Republic Commando books, and I made an LJ account because I wanted to comment on her blog. But my tastes shifted pretty drastically, and now I can't stand her. Mileage varies, I know.