Highly experimental. It's based on the rss feed of only your followers. I expect it will miss a bunch of replies, but it should catch at least some of them depending on how many followers you have. The more followers, the more it will drop replies.
Consider this temporary until we have some real tools.
Pipe Web Address: http://pipes.yahoo.com/geekygirldawn/ZtAR45NI3RGLZxu_xAnzeQ