I don't know how many of you remember the old Ultraman series... but if you do... this image should bring back memories.
So "ultrabook" is the term for the new light and thin notebooks coming out that are comparable to the MacBookAir (so did Apple invent another category?). I've been waiting for these for a long time... especially since I've been drooling over the MBAs ever since they came out... and actually caved in and bought one last year (the MBA 13" which I Bootcamped Windows 7 onto).
And while it's a great machine, Windows isn't very stable (I lose the touchpad functionality after waking from sleep) and have ended up using it in OSX (which actually has better battery life). So I want a native "ultra" thin notebook that has a better keyboard (I miss my dedicated Pg/Home/End keys).
I have high hopes for this category... and while I favor Toshiba's due to the keyboard layout... we'll see what Asus and HP does. I do hope they start using a better screen resolution than the now ubiquitous 1366x768... I can only dream of an ultrabook running full HD 1080p... but you never know.
Right now, because most of the ultrabooks are running 720p, I actually prefer the Samsung Series 7: