More useful might be the new quick-dial functionality included for registered users. You can add any contacts from your phone book and have the service automatically connect you to their voice mailboxes. It saves you from having to enter the number or make a phone call in the first place; it'll simply call you instead.
I still hold true to what I said about SlyDial in my initial hands-on. It's a potentially evil service for people who misuse it (see the guy in the video embedded after the break), giving anyone the excuse that they "tried to call you" without having to approach actual conversation. That said, it can be wonderfully convenient if you want to send someone the equivalent of a voice text message without interrupting what they're doing.