There seems to be a lot of interest in "mass storage" on the ZX Spectrum lately. Well, for the past few years anyway. I guess it's partly a result of online archives such as Demotopia and WOS - "hey, I can download all the spectrum productions that I already have on tape... and so much more besides." Of course there have been various attempts at creating devices, the most recent being generic IDE mods. And now another one has joined the ranks, specific to CF device access. I'm at work so can't really read too much about it right now, but information is over on piter's ZX DIY site.