Yay! I had my Es replaced a couple of weeks ago due to clunking. The replacements don't sound much better (still clunks). So I told them this when my dealer made a courtesy call, and they had me come in this morning and have a tech ride along with me.
The last time this happened, the tech heard the problem and tried convincing me it was normal. And I was like WTF are you talking about?! This time, a different tech came with me, and I could only reproduce it a bit, but he was like "believe me, I know how long this problem has been going on. Regular Proteges, MP3s, MSPs, 626s, I'll just order a new swaybar, endlinks and bushings, and put it on there before your warranty runs out, and hopefully it'll last longer". I'm very happy, especially since most people without a peep from the rear had their swaybars replaced as well.
Chris