[Sparkologist]

A spellcheck facility could prove useful for some people. My spellchecker usually comes in the form of an Oxford English Dictionary.
If I'm unsure of the spelling of any particular word, whilst working on the laptop, I will open up Microsoft Word and type in the word I wish to use. If it appears underscored with a red line, I right-click on the word and a list of correct spelling options open up in a dialogue box.

If a speechecker is implemented, could this also include a method of highlighting correct punctuation usage?

Maybe it could be left to the individual as to whether or not they wish to use a spellchecker. After all, how would it be expected to cope with a post written in mobile text message format; 'teenspeak' for want of a better expression.