I hate to break it to you guys but in all likelyhood the attacks are comming from this site via the linked advertising banners...
I've seen all sorts of pop ups and pop unders...
Posting the source won't help since all you'll see is the link to the banner advert.
best advice, add qoolaid.com to your list of not allowed (untrusted) sites, add blockers, pop up blckers, proy disallowed list or anything else you can think of to try to keep it out.
It's a bad site for two reasons, firstly, it's trynig to download an installer aplpication to your machine, secondly, the screen savers I see in those screen shots look really crap...
I assume the reason that David, (and Myself, and Matt havn't had this problem whilst other have is because the add are region targetted, we arn't in america and so we see different adds.