I think it will be useful if the wodrs in 'Words containing #' section will be sorted.

The words that 'is in your studeis' must be in top of list.

screnshot: http://www.imageupload.org/?d=D03FB8B51

Makes sense to me. What's the logic behind the current sort? Frequency? Be nice to toggle between words studied and most frequent words, or according to difficulty.

I agree. Sometimes it isn't even in the first four words, then you have to search the following pages to find it.

It seems to me like they are sorted roughly in terms of difficulty. I'm guessing that it's using Skritter's own difficulty rating. I have no idea how complicated it would be to have a custom word ordering for each user. One advantage of the current system is that I can see if there are more-common words that I might want to study given what I already know.

I agree it seems to be listed in order of difficulty to some extent, I like the current system as Dependable Skeleton mentioned it's useful to see what words I can learn given what I already know.

It also lets me know if there are some 'easy' or frequently used words using this character which I have missed out on in my studies.

Never thought of it that way. Might be able to make the current system work to help learn more easy words.

It is hard to sort in both ways, so we just do the toughness sort (easier).