Voxeo acquired IMified this week. What is IMified?  IVR for IM.

XO's IVR service earned an award. (BTW, agents can team up with XO to sell IVR service as an overlay).

Ifbyphone is all about IVR in the Cloud.

ACD and IVR are two reasons that small businesses move to VoIP. It is far cheaper to pay for the hosted service monthly than to buy an on-premise hardware solution that can provide it.  It looks like the race is on to make Mitel, Avaya, and Nortel premise equipment redundant or obsolete as you will get up-to-date platforms with maintenance bought as a monthly service, usable by your employees and customers any where in the world.