In reply to ROHC, for me, the big feature is alpha-blending, my brother used to own an Iyonix, and we were both quite bemused by the lack of alpha-channel support in any vector package, except (I think) in Vantage, which is now of course, dead and gone. The other features mentioned above are nice too, and as I'm using a digital camera more often now, thumbnails in the filer would be cool too. Also, despite the lack of Select development at the moment, from a desktop user's point of view there is still more going on than on RISC OS 5, which to the best of my knowledge, has not had any updates of any note to UI/desktop stuff since it's release. The exception maybe the better USB mass storage support, which is very important.
In reply to GuestX, I think it's true to say you can get functional equivalents (or superiors) on many different platforms to RISC OS, but you still wouldn't get the desktop UI of RISC OS, which as far as I am concerned is pretty much the only reason to use RISC OS. Not that it's not a good reason of course. Let's face it, those of who use RISC OS rarely do it for hard headed business reasons.