SEO resources: XML trusted feed

Interested in learning more about XML trusted feed services? These SEO resources will help demystify XML for marketers:

"The Overlooked Killer App: Paid Inclusion," by Kevin Lee. Excellent ClickZ article about the different types of paid inclusion, with an emphasis on XML trusted feed.

"Ending the Cloaking Debate, Part #3," by Danny Sullivan. Good ClickZ article on why Danny feels that XML is an approved form of cloaking.

"Secrets of Successful Search Engine Optimization," by Heather Lloyd-Martin. Heather's Search Day article detailing the Wine.com GoogleGlitch.

A sampling of companies that provide value-added trusted feed services (all from this list provide at least some form of spider-based assistance):

Marketleap (only company with SingingFish trusted feed, has editor, has staff writers)
http://www.marketleap.com
Google neutral

Position Technologies (historically significant vendor, strong spider, provides machine-enhancement)
http://www.positiontech.com
Google neutral

TrafficLeader (tracks ROI, provides machine-enhancement, has staff writers)
http://www.trafficleader.com

DecideInteractive (tracks ROI, provides machine-enhancement)
http://www.decideinteractive.com

Stronger on shopping bots:

Performics (conversion tracking, PPC bid management, offers email marketing)
http://www.performics.com
Google neutral

GoToast (conversion tracking, new Intellidex ad generator, has editor, PPC bid management)
http://www.gotoast.com
Google neutral