How can I play MP3s on Ubuntu?

I switched my old computer to Ubuntu Linux and most things work quite well. However I can’t listen to MP3 music files of watch DVD disks – why not?

Word doesn’t like my grammer!

I’m writing a book using Word 2003. The spellcheck is useful but Word doesn’t like my grammar and covers entire pages in wiggly green lines, even when I believe the sentences are perfectly constructed. It particularly dislike sentences with several clauses. Can I get rid of it?

How do I remove the Twitter Election Toolbar?

I really have no interest in U.S. elections but every time I go to Twitter it insists on showing me a toolbar offering me latest updates on Election2008. I’ve tried clicking the “Close” button but the next time I visit the website it comes back again. How can I remove this permanently>?