It looks like any ads you see for XP Markets are coming in to unsold banner spots from google's adsense. I've asked advertising to see about blocking any more of those.
EDIT: Advertising says that there aren't any ads for XP Markets coming in by google. The only explanation anyone in Advertising can think of is that there are several existing contracts with a 3rd party ad agency. It is possible that one of those agencies changed the banners they are showing without informing the FPA. If you see a banner for XP Markets, please do the following...
1. Right click on the banner and copy the web address/url.
2. Take a screenshot. Save it, the FPA may ask you for a copy later.
3. Go to "Contact Us" at the bottom of the page. Send in that web address with a note that it pointed to an XP Markets banner.