Inspell is an inline corrector of spelling for iOS as a Cydia App. It uses Hunspell dictionaries to support many different languages and can setup shortcuts to expand text entered often to save time. This tweak will not autocorrect, leaving you in control. If a word is misspelled, it underlines it like MSWord you select the word to get word suggestions.
When you select the underlined text, you can select the correct option. If it's not available, simply begin to type the word your fat fingers meant to type. You can also set-up shortcuts for "autofilling" a few letters, words or entire sentences. Works great for a standard signature completion.
Hopefully this Cydia tweak will help you stay off the Auto Correct Fail websites!
Inspell is available through Cydia for $3.99 and is one of the best paid Cydia tweaks for your iPad.