I was really fascinated by this book, even if it was a tad long. I find the idea of writing near-future sci-fi to be one of the most challenging types of stories, especially when the political climate can change as dramatically as it has since Earth was written: I get bogged down in the what-ifs of it all. Anyway, I'm impressed with the "prediction" factor, as it seems Mr. Brin has balanced interest with plausability all with skill. I wonder if the the larger alien intervention idea wasn't influenced by a similar one in Sagan's Contact.