Monkeying Around With Text
TextMonkey strips away all the formatting rubbish that accrues when you move something from an email or a webpage to a document. It does it all very intelligently, too.
If you’re just looking to resolve some formatting issues relating to ‘commented’ text in email threads, then I’d start with the free version, TextMonkey Lite. If you’re a hard-core text copier, splash out $30 for the full version.