Amazon has finally stopped teasing and let the 2.5 Kindle firmware update loose for all and sundry. It had become available as a download for international users a few days ago, and as of today their American counterparts can partake in the same manual update. But only if they wish to be proactive. All Kindles that have their wireless connections turned on will be getting the drop over the next few weeks. So what's all the fuss about? In version 2.5, you'll be able to organize books into collections (or folders as most of us call them), share