Although 50 Cent has collaborated with countless musicians, few of those tracks made it onto another artist's album. With the reggaetón duo Wisin & Yandel and the track "Mujeres En El Club," 50 Cent not only made the album but took it upon himself to promote the song and feature it on his Web site. The move highlights the importance of the Latin market to one of hip-hop's biggest stars and opens the door for other high-profile colla…