We use Freedom Voice ourselves. We have been using them for over a year now and they are fantastic. We needed the web service so we actually became resellers to get that extra service at a lower rate. They offer quite a bit and even are preparing to offer local numbers as well as web / tele- conferencing.

They might be a bit more expensive that gotvmail, but well worth it. We especially are starting to get more calls now that we implemented their netcall feature. You place some code on your website and the user enters their number. FV system calls the number and conferences us in with the caller.