http://www.daemon-tools.com
No need for CD swapping. Now you can play directly from HD.
It uses the images of many popular burning programs (like e.g. FantomCD, Simdisc, Disc Juggler, CloneCD, Blindwrite, DiscDump, CDRWin and others). And this is one of DAEMON Tools' biggest advantages - you can immediately mount a created image of your CD as a virtual DVDROM