Can you watch DVDs on your computer? If so you can probably take caps. After that it's just a matter of uploading them to Photobucket.com.

If you don't have a DVD player you can get one here (http://www.intervideo.com/jsp/Home.jsp). Yeah, it costs :-\ Free trial though. If you have a specific set of DVDs you want to cap you can do it that way. And I consider it worth the money to buy it, personally.

Do you need a special drive in your computer to play DVDs? Er, I don't know. Mine came with one X-D

*hopes someone more helpful comes along*