Quote - So how do we determine if there's interest?

The best way is to be able to show that there's a reasonable level of traffic in the relevant generic forum (which I'd guess would be -> 2D Graphics) and the easiest way to do that is have people use an appropriate tag in the subject, e.g. something along the lines of "[curvy]" or "[DW]" to make it easy to distinguish threads for those applications for those who may or may not want to read them and makes it simple for the staff to gauge the interest by doing a search.