I am building a site right now that could use these features immediately. In fact the ability to export transactions via XML to external accounting apps would be most useful as well (this I will probably be doing any day now)... also, manual transaction entry on behalf of the client (for the many people who call and want to buy stuff, but still dont trust the web).
Most importantly, figure out a seamless way to replace Cybercash. I was told today by an informed source at Cybercash that they will be shutting registrations any day now as they port all clients to Versigns system.... there will be a period where they redirect transactions but eventually all ACS users will have a problem. I suggest check out IONGATE who have a fairly good gateway transaction set which could be made to work on ACS. ... mostly .. its cheap ...
Good stuff Rad .. keep us informed.