Ich schreib jetzt wieder auf blog.assbach.de. Schau doch mal dort vorbei. Hier wird nicht mehr viel passieren.
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merging multiple rss-feeds into one

I recommend using Yahoo Pipes  or xFruits.

The following might work for some as well but didn't work for my intention to merge all pics and video favorites into one feed.
most of them just showed the title and no content (pic or video) :

Results:

 More details in my german blogpost
"Mehrere RSS-Feeds zu einem zusammenführen".

(download)