I recently upgraded 10.4.11 to 10.5.1, and the Finder keeps doing something that's driving me batty. At random times when I'm clicking around, sometimes in the Finder sometimes in the Dock, something sends decides to tell my web browser to open up a URL like this one:
http://a654.g.akamai.net/f/654/39/5m...p;T9=4127& . Being the control freak about my computer that I am, it infuriates me to have the computer randomly interrupt what I'm doing to bring up advertisements

.
So, my question, has anyone else seen this and does anyone have an idea of how to make it stop? I've scoured help files, Google, etc, and the only mention of the Content Guide I can find is a checkbox in Quicktime's preferences for "Show Content Guide automatically." Naturally, I have that unchecked, but that only effects whether or not Quicktime shows the Guide when I launch Quicktime. This behavior pops up in two different accounts, one which uses OmniWeb with media plugins disabled (and thus it downloads a file instead of displaying it, and frequently seems to try multiple attempts at displaying the Guide

), the other uses Firefox with plugins and displays the guide inline.
Thanks in advance for any help.