I am using Daemon Tools and I think it's the best. The latest free version DAEMON Tools Lite 4.35.6 has support for Windows 7 and formats: cue/bin, iso, ccd, bwt, mds, cdi, nrg, pdi, b5t.
I also think that DAEMON Tools Lite is the best software for emulation. Not only it's fast but also very functional.
By the way net89 - this download24.com of your is a fantastic site, i'll surely come back for new downloads
Thanks for sharing