I think it would be a great thing if we somehow could see how difficult a word or character is considered to be while training.

This could be based on how well you have done with this particular word before, or on how common the word is, or even better: both.

Like:
pinyin: hǎo
Meaning: Good, well, very
Difficulty: Easy - 90% correct,very common

The word of course is 好, the 90% means that 90% of the time, you have gotten this word correct. The very uncommon obviously means that this is a very common character.

Or another example

pinyin:dá
Meaning: The flight of a dragon
Difficulty: Impossible! - 0% correct, extremely uncommon

This time the character is 龖, which is a character thats hardly ever seen, and therefor considered very difficult.

This would make it a lot more fun to train.

If you click the magnifying glass when practicing, it tells you there right at the top.

Ohh, I didnt know that ^^

But still, it would be great it we could have that on the "main page", without having to click the magnifying glass every time.

The statistic is interesting, but I don't think it's interesting enough to put in the main prompt. Not all that many people asked about it before we put it in, which is the measure I'd use. Perhaps when we make it more precise by factoring in the average difficulty on Skritter, then it'll be important enough.