I don't disagree with the above. When a more loosely defined medium that you are immersed in (for other reasons as well) is available, the adoption of a newer tool with its own usage patterns and so on can be a needless pain. I am a sucker for Internet tools, and hence a poor judge.
There are a few new possibilities with a tool such as this... not only can those who don't want to miss out interesting news bits or analysis do so without having to keep up with list traffic, but (and this is a point I have made before) also it helps us reach others who may not already be on the list or get their info in that manner. And the voting scheme may also bring about some participation from the vast lurking majority. On the other hand, if some of us who post links and such to these lists (PEN-L, LBO, in my case) switch to posting them elsewhere, then current readers are forced (if they are interested) to adopt this new tool (unless a summary of the day's links is posted to the lists, if acceptable).
Perhaps more of you can comment on the pros and cons? I see that a few of you have already expressed interest, and I can quickly setup a version on my site (which we can migrate elsewhere if necessary) for you to play with. There are other things to consider as well -- for example: I do not want to draw the discussion away from an author's original site (which, for left-leaning site, is often an unpaid labour of love on the author's part), but we can discuss those details once we decide to go live.
--ravi