I have a Netbook, which cost about 1/3-rd of what they ask for ultrabooks. Mine is an MSI U100, which is no longer on the market. I think that some other Netbooks are still sold. The "Atom" processor isn't too sprightly, but I used it on a recent two-week trip and didn't feel hampered. I did quite a bit of C programming and compiling during the trip, as well as making and editing presentation slides..
Like Genghis', it has 3xUSB, VGA, 3.5mm audio-out jack socket, SD card slot. I carry a wireless mouse, since I can't get used to the trackpad / touchpad. Like other Netbooks / Ultrabooks, it doesn't contain an optical drive. I bought an external (USB) one which I leave at home - nice to have for loading software. Even with the optional larger battery, it's light and goes in my carry-on bag. I have a padded sleeve for it, which has a zipper pocket for flash drives, etc. I can't imagine carrying a "full-size" (15" 17") laptop any longer.
I've used it for OpenOffice Impress (read PowerPoint) talks.
Like all laptops, etc, it has an external charger, which is also small and light enough to go in a corner of my carry-on. I