Hej,

I've just pushed a small applet to extras-devel (obligatory warning in red, and it's there for a reason, see below) that provides a simple on-off switch for onion routing via the Tor network.
The applet basically listens to ConIc for connection events and starts the polipo web proxy and Tor daemon when needed, modifying the current proxy settings to route traffic through them. For more information about Tor, see http://www.torproject.org.

It seems to work well here mostly, but I've had it crash the hildon-status-menu while upgrading the status-area-applet-tor package. If this happens while onion routing is enabled, this will leave the tor and polipo processes running and the proxy settings will stay modified. To get back to a clean state, I had to kill the tor and polipo processes and disconnect/reconnect the network connection to get the default proxy settings back.

Also, so far it will only work if you don't use a proxy already. There's no mechanism yet that tells the Tor daemon to use the original proxy settings (before overwriting them).

Here's the garage page: https://garage.maemo.org/projects/tor-status