On the long drive to Vienna we talked about weblogs and google. While nobody outside google actually knows how their ranking algorithms work, my feeling is that one of the most disrupting thing about weblogs are blogrolls. And not because they appear on many blogs, creating a huge mesh, but especially because they appear in every page of a blog.
Radio creates a page for every day, week, month, other blogging application are publishing one page for every single post. In my case I have about 800 pages in my site, and my blogroll is inserted on each single page.
So if I add somebody to my weblog, I will basically create 800 links to his blog. Multiply this by the number of weblogs and you will realize that it's quite a large number of links to count.
Now: what if google would ignore blogrolls? Technically it can be done, the guys at BlogStreet have been doing it for quite a while. When I publish a blogroll I actually want to link somebody once, not hundreds of times. Of course, links within posts are an entirely different thing and are usually the most valuable ones, at least to create reliability in search results.
Otherwise, google could simply read RSS feeds, Feedster is already doing it.