DrugMonkey, Nick, Afarensis, Chad and John explain it better, but in short, each SciBling needs to pick two regular readers who will, over a longish period of time in the future, tag (in delicious, with a special tag) three site-wide scienceblogs.com posts of their interest. These posts will be included into a special reader-generated feed to which you can subscribe, and it will be visible on the front page. I am not sure, but I think the final list will be secret and I do not know for how long it will be valid, i.e., at what time intervals we need to pick new two people (every six months, year?).
So, help me out in the comments and nominate each other (or yourself) for this position. Who reads multiple scienceblogs regularly (daily?), has good taste in posts, knows how to use de.licio.us (or is willing to learn - it is super-easy), perhaps prefers topics that may not be overwhelmingly popular site-wide (so the feed does not turn just into anti-Creationist rants, for instance, but has diversity)? Let me know in the comments or by e-mail. I think we have some time to turn in our two names (and they have to make sure that nobody was picked by two or more SciBlings) so take your time thinking and commenting.