MySpace has strict requirements for subpoena information. Subpoenas must be delivered by personal service to their California registered agent. Subpoenas for civil litigation in states other than California will only be accepted if they have been properly processed through the California court system. All requests must include the unique user identification for the account.
Webservers in general are often subpoenaed for logs and other information, so the answer to your question is yes. The likelihood of this happening, however, is a different consideration - copyright infringement, for example, isn't enough for this occur as that is a civil, rather than a criminal, case of misconduct.
Your MySpace profile can be subpoenaed by a court if it is suspected as related to an illegal act or if it is part of a criminal investigation. It can also be reviewed by MySpace if they suspect it if in violation of the user agreement.
You can through the proper authorities. One would need to get in contact with their local law enforcement agency, or contact a lawyer in order to get a court order to release information.