I will probably be doing that in the next 2-3 weeks.
We're rolling out Navision in Belgium (replacing SISA) and in Germany.

I will have to:
send payments of commissions to salesmen
send invoices to customers
track payment of invoices (open/closed status)
All through interfaces to Navision.

We hope that we can interface it to the banking systems in Belgium and Germany so that it can make and receive electronic payments without having to add a banking module like we did for Oracle Financials - that was a right royal pain.