For the record, ImgBurn is, in my personal opinion, one of the best iso/disc image burning software. It is fast, versatile, powerful, reliable, free, and light (doesn't take a lot of HDD space to install nor memory to run). I've used it for burning everything from CD/DVD .ISOs (including bootable OS install discs) to Video_TS folders for DVD rips.
Glad to hear you are having a good experience with Win 7. I've been loving it from beta 7000 to RC 7100.