Roundup articles are a little like “freebies” for web content writers.  Presumably you’ve been writing in the same niche for a while and have several articles about a few very precise topics.
A roundup article is basically a compilation of all those articles, with links to several of them.
An example of one of my roundup articles [...]

I got a note form the Minneapolis Homeschooling Examiner saying “Just saw that you’re Lisa Jo Rudy too. I thought I was the only examiner to have all my articles eaten by her profile!”
Confused, I headed over to examiner to look up this Lisa Jo- was she stealing my articles?  Hardly- she writes about autism [...]

Examiner.com recently announced that they’re providing another “perk” for writers.
You and your family now have access to a variety of discounted private health plans! Available through a new partnership powered by JLBG Health, this program is the go-to resource for finding affordable coverage and sound advice. With live help just a phone call away, [...]

I know you skim over marketing emails, too. 90% of them are just spam- designed to remind you that you once thought something was interesting enough to add yourself to an email list. But the fact is, for me anyhow, that if I don’t buy it right away, chances are that I won’t even [...]

So, much to my surprise, I’m currently registered as a writer at Demand Studios.
Again.
If you don’t know the back story, here’s a link to the drama: OMG I got fired from DS
When Eve originally informed me of their decision, I sent a response, stating my side of the story.  I sent a note of apology to [...]