The entertainment and pop culture field on the Web is about to get even more crowded. Next month, America Online’s Greenhouse Networks will go after E! Online’s market when it launches Entertainment Asylum both on the Web (www.asylum.com) and on its AOL service. The site will focus on real-time, behind-the-scenes coverage of stars and shows–the format E! Television was built on–as well as offer a personalized movie database similar to E! Online’s Moviefinder.com.