I have an EEE 901 (the xp version), which has the following:
Now, if only sound that didn't go through Microsoft's DirectSound was played at the same volume as sound that was. This is really annoying when you're trying to listen to music and read Slashdot or something and the music totally dwarfs your text-to-speech software in volume.
Anyway, what I'm trying to say is
I call it being able to hear the "sound shadows" of objects, because that's really what they are - an object blocks sound, and that blockage is projected to the ear. With a good cane, I can navigate around tables, columns, and even position myself relative to peoples' voices to keep myself from running into them. It's quite amazing what you can tell with a good hallway, and a constant sound source (soda/vending machines are good). For example, an open, echoy space usually means a stairwell.
Also, randomness
Anyway, I have both my EEE 901 and a BrailleNote, and the EEe delivers so much more (x86 compatibility, faster wireless, ETC) than the BrailleNote for a similar size. The refreshable braille display on the BN is its only advantage for me.
If you want to put yourself on the map, publish your own map.