Now that their series is over, I'm glad they're still being used. I'm hoping we'll see them pop up in other places.
For those who like the classic versions of Zan and Jayna, DC is releasing a hardcover collection of The Super Friends, issues #1 - #26. #1 - #6 feature original Jr. Super Friends Wendy & Marvin. #7 - #9 introduces Zan and Jayna, who work with the Super Friends and Wendy & Marvin, who depart the series at the end of issue #9.
Volume one of the set is to be released this week, and looks like this.
There is also going to be a Volume 2 that will collect the rest of the series, issues #27 - #47. This is the current cover, but since the first one changed, this one may as well. According to Amazon, volume 2 is due out mid December.