Catablog has links to studies regarding the current state of megachurches (over the last few years).
Here are some of the findings, but go to Catablog and hit the links to the source materials for more detailed information.
“Megachurches – Protestant congregations that draw 2,000 or more adults and children in a typical weekend (attendance not membership) – show considerable consistency over the past eight years.
They continue to:• Grow in size,
• Lead the way as America’s most multi-ethnic class of church,
• Show a strong bias toward contemporary worship, and
• Remain minimally involved in politics.However, they also are institutions in transition. They are now:
• Offering more worship services and expanding to multiple-locations,
• Shifting to playing a greater role in community service,
• Decreasing their use of radio and television, and
• Putting greater emphasis on the role of small groups.”