I know quite a few Xobni users who have one problem with their pro service. It only works with Outlook. That has all changed over the weekend with Xobni announcing Xobni for Gmail. They have made it now possible to tie in Xobni with your Gmail and Google Apps account for free to find and manage your contacts. The plugin simply shows a sidebar in Gmail to help you find and search contacts just like you can currently do from Outlook.
So now that you can use your BlackBerry, Outlook, and Gmail does that make you hooked on Xobni? Have you tried the app/service out? Check it out at www.xobni.com and sign up for the Gmail beta at this link.
Here is an idea of what it looks like. I am going to give it a spin and report back what I think!