I just got a 700W and have been researching which of these approaches is best. I just bought a 2GM card and was not excited about having to pull it out to go on Wi-Fi, then I discovered the SanDisk card with 128 and 256MB of memory built in. That seemed like the best alternative until I discoved Enfora which goes on the bottom and leaves the memory slot available plus a souped up battery. It says it is for the 650 and I wonder if it will work on the 700W? What has been your experience with either of these routes to get on Wi-Fi? Sure would be nice to have it built in.