I have tried (repeatedly):
1) The "Microsoft Recommended" procedure in IE9 Internet Options
2) Searching for and deleting Suggested Sites from the registery
3) Deleting Suggested Sites and Bing from the favourites bar
4) Disabling Microsoft Search helper in "Manage Add-ons" under IE tools
Unfortunately, without fail, suggested sites reappears on the next re-boot.
I am starting to think that Microsoft does not want users to be able to eliminate their "service" since it helps them compete with the other search providers.