We (segNET) offer what we consider to be very aggressively priced hosting, but we're not offering virtual hosting for OpenACS projects just yet (we're looking into this) as AOLServer does not support this, at least not as well as Apache does.
Our model is essentially to build a service to spec, and our location, size and dedication to OpenACS and ACS developers (among others) allows us to be substantially less than the "big boys" (Exodus, RackSpace, etc.) while - we think - matching their QOS.
Plus we're open to suggestions, if there are a couple of folks looking for a shared resource, maybe we can build it for you.
