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 keep a page with this title on each one of my sites, saved as a draft or password protected. I use it as a general “things to do next” and a place to document the invisible work I’ve done on the site. It’s amazing that I can remember what each of my six kids [...]

Almost a year ago, I wrote about my Suite101 earnings, because one writer made $5000 in a month and they finally told us we were allowed to discuss our income.
I’m revisiting that topic this year because the industry has changed a little, so have my earnings and my writing habits and Suite101’s best practices
My Suite [...]

How to Access Clipboard History
It’s my own fault: I should be writing in a word processing program, instead of directly into the edit box at Suite101. In my defense, I was out of the habit for a while because their interface didn’t support the Chrome browser. So instead of using Internet Explorer or Firefox, [...]

I landed on a website the other day that had like 5 Adsense blocks and several more link units. If you’re running Google’s Adsense on your site, you need to familiarize yourself with their terms of service because you’re only allowed to use three of each on a page. I’m glad I skimmed [...]