Substantial memory savings by purging the NSURLConnection's request in the shared NSURLCache. Without this, popping in and out of an EDP (loading images for the first time) can grow the heap by ~2-3MB. From analyzing our memory usage in Instruments, the primary cause of our growth appears to be in the networking code (creating large CFData objects and keeping them around). The other areas to look at are in DataService and Product, where the sheer number of objects created is contributing to our bloat.