Did BALCO's Victor Conte Leak Testimony?

That appears to be the case as email seized by the FBI seems to indicate:

SAN FRANCISCO (AP) -- E-mails seized by federal authorities identify the convicted founder of the Bay Area Laboratory Co-Operative as a source in the San Francisco Chronicle's reporting on the steroids scandal, according to an online court filing that accidentally revealed confidential information.

The filing details exchanges between Chronicle reporter Mark Fainaru-Wada and Victor Conte, who jokingly suggests in one message that he be placed on the newspaper's payroll in exchange for information about grand jury testimony by elite athletes.

It was unclear from the filing whether Conte provided the reporters with grand jury transcripts, but it does show Conte discussing the testimony of athletes about their steroid use.