Be careful if using eHealthInsurance.com. They do not honor unsubscribe requests from their mailings. I’d suggest using a unique email address so you can disable it after you’ve used their services. I’ve emailed their privacy office asking about this. If a week goes by, I’ll escalate to TRUSTe.
I originally signed up with them on October 9th, 2007, unsubscribed on March 24, 2008 (after they emailed me five months after my last contact with them), and then again today (June 2, 2008) two months after opting out.