Network Link Conditioner for poor connection testing

According to this post, there's now a network link conditioner in the new Mac OS X Lion. It looks like there's no more need to run across the city trying to find a place with poor connection in order to see how an app will behave or configure ipwf. You can just set the connection type and quality you are about to test for.

If you still use Snow Leopard (like I do) or you want to configure the downlink to a particular bit-rate, you can use ipwf on your Mac.