I think everyone has answered this question really well (intentionally or not): OS 8's real usefulness is pretty narrow:

- Only one version is really of any use at this point: 8.6

- It's particularly well-suited only to a narrow range of Macs made in only two years - 1996 and 1997

- It's got a similarly narrow RAM sweet spot: at least 32MB RAM (the minimum for running OS 8 comfortably) but less than 64MB (at which point it becomes possible to run OS 9 comfortably).

I think that's a pretty small hook to hang your hat on, as far as building a fan-site or special-interest software archive.