Acer's Aspire S3 is probably one of the coolest Ultrabook just released today. I have been a big fan of ultrabooks for years and remember I got Sony Viao 13.3 inch years ago but for $2,200. It had only 60 GB HDD and 512 MB RAM.
Today, Acer's Aspire S3 is 13.3 inch with i5 processor, less than 3.0 lbs and under $1000. This is much better price than Sony Viao 13.3 inch.