* had a Back button in Mobile Safari that consistently redisplayed a cached version of the previous web page, by default. use a portion of the flash space if needed for this cache
* had a way to temporarily disable device auto-rotate -- the bane of users who are moving or fidgeting or laying down
* Photo collection synching -- why is the only way I can get them off by selecting up to 4 at a time and emailing them to myself? They're just files. Copy them to your host desktop just like all those other files they've been synching for years.
...the color white? purty, but, not a substantive improvement like the above would be.