Right now, ISAs are mostly used to fund students' attendance to trade schools and non-profits (source). However, as the student loan debt crisis escalates to Godzilla-like proportions, ISAs are gaining traction. 

Some young people attending traditional, four-year universities are now turning to ISAs as a viable alternative to student loans.

ISAs can also be useful for non-students looking to collect investors (source). Now you know where to turn when you're finally ready to launch that pancake house-come-nightclub. Such a good idea.