I just ordered a replacement idler from TerraCycle for the X-Stream.  They have two versions available, Sport and Team.  Since I haven't been invited to ride on any RAAM or TTT teams I decided to order the Sport version for about half the price of the Team.  Here's an interesting story about the stock idlers on the Rans RAAM Team X-Streams:
 
http://www.bentrideronline.com/?p=2139
 
If anyone is interested in ordering a TerraCycle replacement idler you'll need to call them.  They don't have them listed on the website yet.
 
 
Trey

I installed my team idler yesterday.  The difference in noise is amazing.  The original idler was a noisy beast plus it's other issues.  The new idler makes the drive team feel more solid and cuts the noise by 90+%.   There is still just a slight noise that might be the teeth on the chain.  I am going to put the bike on the trainer tomorrow and get Marci to do some spinning.
 
I ordered the team, figuring that if I am already spending 80+ shipping,  the extra money is not that big a deal.
 
Next purchase will be it's own ventisit,  just easier than switching off with the Strada.