I had heard the the iPhone 4 had a whopping 512 mb of memory. But when I launch System Activity Monitor, the total of all memory (free and in use) comes to about 236 mb. Am I missing something? Is SAM wrong? Or does the iPhone 4 only have 256 mb max? EDIT: Okay -- this is weird. I just closed every application that was sitting in the multi-task bar (about a dozen). Then I reopened SAM. I had a total of about 445 mb of memory. What gives? Do apps in the multi-task bar sequester memory? I thought they weren't supposed to consume resources.