Planet Wikimedia and Open Wiki Blog Planet aggregators are similar, but not the same. Because of that I wrote a simple program (download) to aggregate both of them. Script may aggregate more aggregators and if you find some interesting wiki-related blog aggregator, please let me know.
Now you may replace both feeds with this one: http://tools.wikimedia.de/~millosh/agags/atom.xml.
Update: If you want to run this script on your computer (or anywhere else), download version 1.1. Version 1.0 has some problems in parsing <entry> tags. Soon, I’ll add it on my SourceForge project page.