Since Techmeme kindly provide details of their top 100 sources in an OPML file, I've mashed up in Yahoo! Pipes a feed that gives you the current post from each of the top 20 sources - you can subscribe to it here care of Feedburner:
BTW In case you are wondering, for some reason Yahoo! Pipes can't loop and serve up the current post from all 100 sources, so you'll have to make do with the top 20 instead. 20 is probably enough to stay on top of what's current anyway... I certainly never have time to read all of Techmeme anyway.