The only improvement I've been wanting to add but haven't yet is to have it offer suggested spellings. I started on it, but it's a bit on the tough side. For example, using the typo "impliment", you and I can look at it and know there's only one letter wrong. But to have software do the same thing is pretty tough. If you narrow it down to only words that have the same Soundex() and the same number of characters, you still get a list of about 40 words.
And stepping through the word one character at a time and doing the same with each of the 40 possible candidates is pretty processor-intensive.
But it still may end up being how I do it.
The alternative would be to have the system keep track of frequent "typos" and regularly add them to the dictionary or add a field that shows what the correct spelling of a frequent typo is.
News 
Market Data 
Discover 
