It would be great if when making a custom list users were prompted to select a category that the list fell into, e.g.:
- Textbook
- Literature (books, poems)
- Media (movies, TV shows, magazines)
- Technical (professional, scientific, academic)
- Common Chinese (everyday usage, frequency lists)
I suggest this because I was just taking my first look through the custom lists, and within the first few pages found a few gems (this and its later editions in particular http://www.skritter.com/vocab/list?list=99447023 !), but after the first few pages realized that any further searching through the list would be pretty cumbersome. By categorizing lists users could quickly go to the set of lists they're interested in - I personally have no interest in other Textbook lists (at the moment), and these seem to partly dominate the pages I looked at.
Another useful addition would be some type of sorting system, either by frequency of usage among Skritter users (most popular custom lists) as well as ratings (by Skritter users).
There's a great wealth of material already in the custom lists, but I feel its somewhat inaccessible in the current format of 1000 lists spread across dozens and dozens of pages.