Here are some of the highlights from the week's Web Tech action on ReadWriteWeb. On the product side we reported on Nokia's buyout of the open source mobile OS Symbian, reviewed a "memory augmentation" service and a semantic search engine, and looked at what LinkedIn's strategy tells us about the IPO market. On the trends side, we contributed our 2 cents to Yahoo's board, investigated another Wikipedia controversy, analyzed the capacity of web 2.0 to bring about "change",...