Folders To Querystring

I would like to have my site do the following:

Rewrite: http://site.com/field/value
to
http://site.com/index.php?field=value

I would like to add exceptions, though, like:
http://site.com/includes/
http://site.com/images/

The field must always be
However, the value can have any punctuation (like Web2.0)

Any help would be appreciated!