I can't imagine this hasn't been brought up yet but I have little time at the moment. I've noticed that you can exceed the max writing capabilities on a CD. I don't know how much. Would it be possible to write a 795MB file on a 700MB. Let me know please... I'll try it sooner or later anyway...
Yes it is! The XCD project is working on this issue and they have some software ready for the purpose. Note that the cost is reduced error correction, so don't use this method for valuable data archiving and handle the discs very carefully. http://www.cd-rw.org/news/archive/2881.cfm