Most people who want to play around with Oracle just download a copy, install it, and begin their adventure. It is very difficult to find another individual's database to connect to just to play around. I would suggest heading to Oracle's Technet, creating a free account, and then heading to the Download section. Download a copy of Oracle9i Enterprise Edition and install it on your workstation. Then you can play around all you want. The download can take a while. Basically you are downloading 3 CDs worth. If you don't have the bandwidth for this type of download, Technet will let you order the software on media for a small price.
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