It is possible to access the PVConnect settings from a browser but you first have to enable it. In order to access it from PC’s on your network you have to first make changes from the local browser. You will need to be comfortable with Remote Desktop in order to continue.
1. Start a Remote Desktop Session to you HP Media Smart Server.
2. Login as administrator.
3. Open a web browser.
You should be greeted with this screen. Click Twonky Media Settings.
Now change the web access to Public Access and save changes. You are done! You can now access this page from any browser on your network.
But wait! Did you see the mobile browser links on that first page?
Oh yeah baby! Have fun!
Update: Here is a shot of my HTC connected to WHS via it's Wi-Fi.
Disclaimer: I have only used web access to PVConnect in order to view settings. I have not made changes and I cannot say if it has any effect or ill-effect on the WHS Add-In. I'm just recklessly publishing what I found! Thanks goes out to the twonky forums and mediasmartserver.net forums for keeping us up to date on PVConnect.