Intelligent Media Fetch (imfetch) is a download client for Real Media streams. In other words, it lets you download a stream that could be viewed with RealPlayer and save it to disk. This is already possible with programmes such as mplayer. However, if you just want to download these streams, and don't need the other features of mplayer, then you may find imfetch easier to install and use.
It is planned, in the future, to develop imfetch into a client for other types of media streams as well as add the ability to transcode the stream to other media formats. This is why the name imfetch was chosen, rather then rtspfetch or something similar.
Note: imfetch does not, as yet, support ".ram" files. If you want to download a Real Media stream that appears on a web site to be in a file named "something.ram", download this first with wget and open it in a text editor. Use the URL contained in the file that looks like "rtsp://.../".