I have made no secret that Xero is my favoured online bookkeeping site. I am applying for Xero Certified Partner status and that will allow a lot more marketing activity to include the official logos. I am hoping this will be in place in a week or so.
I already have a number of clients using Xero and I am also using it for our own books, so we do have a considerable knowledge of how it works, which bits are still needing development and how to make it work for all who use it.