FirstPerson: What a decade. From Y2K to 9/11 to natural disasters to historic presidential races, the past ten years have seen many unprecedented events. What has affected you most over the last decade? What was your best moment — or your worst? Be part of msnbc.com's Decade In Review, a picture-packed look back at our lives since 2000. Send us your photos and stories (don't forget to include the year they happened). We'll publish the best ones.