Many years ago I dated someone from work. I know it can work out for many people but you will be the focus of office gossip and you should definitely think about it before jumping in. You also end up talking about work when you're outside the office. My lovely husband is not related to my work in anyway and that suits me just fine.
I married someone I worked with :-)
I think as long as you don't become a serial workplace dater, then why let the fact that you work with someone stand in the way of true love. But I've seen the occasional person literally work their way through the workforce, and whilst that is all good fun (and hell, why not!) it can mean that they develop a bit of a reputation and aren't taken as seriously.
No way. Wish to keep work and private lives separate. I would not risk my career, especially if things go pear shaped. Then again, this bravery has worked for many people. If you're not too attached to your work, go for it.