If anyone is interested there is this site ( http://spoon.net ) which hosts virtualized apps which runs on the Windows platform. It installs a small dotnet app which allows you to run many free virtualized apps. Interestingly enough there are at least two apps which might be of interest to the OBi community. It is free to signup. The ability to run a sip phone using the browser might be interesting. I have not seen too many apps with this ability.
The virtual app can store the various settings (Sip acct/camera/sound, etc...) in a sandbox, which will disappear after you close the app. There are many other useful (free) virtual apps as well.
http://spoon.net/XLite (Sip softphone v3)
http://spoon.net/GoogleTalk