Just like gorky said
In the future if the drive is stuck (you may already know this), but you can manually eject discs with a paper clip via a small hole on the front of the drive. Just straighten out the clip and ram it in there.
If you need step by step instructions (with pictures) on how to do this.. checkout the "CD/DVD drive Troubleshooting" page in the Beginners section at my website.
Hope this helps,