Rumor has it that Google is buying GrandCentral for $50M. According to TechCrunch's bio on GrandCentral:
"The basic idea around GrandCentral is one phone number for all your phones, for life. As we change jobs, homes and cell phones, there are a lot of phone numbers to keep track of, and keeping everyone up to date with your most recent phone numbers is a real cost. If you use GrandCentral you can give out a single phone number. What happens when that person calls that number depends on his/her relationship to you, and what you are doing at the time."