We have the MSS 2007 (beta) Developer edition which allows you to develop on your laptop/workstation. The development is supported on Windows XP and Windows Server 2003 Std/Ent. You will need Visual Studio 2005 with Windows workflow foundation installed.
Once developed, you can deploy and test your speech application from the same machine(by either calling the server with a Softphone/Actual phone, or use the integrated debugger with just a mic and a headset). We have enabled the use of 2 ports on Dev edition.
So in essence, it will behave exactly like the Server with port limitations.