Your web pages have been useful to me so I am responding to your query about USB and sound card modes and laptops.
USB is a bus which can control multiple items and is therefore not suitable for rig control without substantial additional hardware and development. The only practical approach is to use USB-serial converters.
I am running MixW on a Compaq laptop.
Here is the data I have gathered:
The Kenwood TS-2000 control program works fine with a pfranc usb to serial connector as does Link700 (3rd party memory control/settings program) and the Palm synchronization (program loading software). The Kenwood free "Memory control programs" do not work with the usb to serial converters (I've tried 3 different ones). Because Link700 works for the TM-D7 and the TM-D700 for settings and uploading/downloading memories, I do not use the Kenwood programs for them. Therefore I use the "real serial port" with the TS-2000X so I can use the Kenwood "Memory Control Program" with it to upload/download memory contents. QuickMix from http://www.msaxon.com/quickmix/ is an extremely handy utility for saving soundcard settings and it will work with multiple soundcards. I use it with desk shortcuts for setting up the Extigy for the sound from the TM-D700 or audio from the TS-2000 and I use it in the MixW startup to set the stored levels on the on board sound card for the sound card modes. I hope this provides you with some useful information for your web page. Jack K8PET