There is no email client at the moment on XO, though one is in the works. I just use SSH (installed by default) to log in to my computer at home and check mail with mutt. According to /proc/cpuinfo, the process or is AMD Geode, running at 430MHz. In use, it doesn't feel particularly fast or slow to me. According to /etc/X11/xorg.conf, the screen looks to be 1200x900. In black and white mode, it looks like the screen is higher resolution still (it looks incredibly sharp) but I don't see any references to that in xorg.conf. The OLPC has 1gb of total flash storage space, with 327mb used by the basic system, leaving 698mb for additional programs / data.