I started using Remember the Milk a long time ago. It is the best app for managing task and it helps me a lot to do my daily work. Also I love Alfred. It is the Mac thing and can be compared to Launchy. Helps a lot in your daily work and it is easy starting applications or switching to them.
Some days ago I thought, it would be great if I could use Alfred for adding new tasks to Remember the Milk and after a short search I found a workflow.
Works great, but see for yourself:
Remember The Milk: http://www.rememberthemilk.com/
Website of the workflow creator: http://benzi-ahamed.tumblr.com/
On twitter: https://twitter.com/benziahamed
On Windows, try Launchy, but there is nothing there for Remember The Milk I think……