Back in May of 2007, I reviewed GrandCentral–a service that provides a virtual phone number with a seemingly limitless bag of tricks–for Slate. My verdict was mixed. But GrandCentral passed one important test: Sixteen months later, I’m still using it. In fact, I’m using it as Technologizer’s business line at the moment: It’ll ring my call phone or any other phone I want, lets me screen calls, and includes slick Web-based voicemail. Did I mention it’s free?