According to reports, Dell is likely to begin shipping Netbooks with Ubuntu Light.
Ubuntu Light, also released on 10th October with Ubuntu 10.10, is an instant-on Operating System for internet browsing, email etc. on the go. It is not meant to be a replacement for Windows - rather Dell may install it alongside Windows 7. It is something like Splashtop which many HP laptops comes pre-installed with.
It is expected that Dell Netbooks with Ubuntu Light will begin appearing within a month. Given the fact that among the major manufacturers, Dell sells the largest number of machines with Ubuntu pre-installed, it is no surprise that Dell is expected to be the first OEM to release one with Ubuntu Light.
Canonical does not offer Ubuntu Light for download (not yet at least). Currently Ubuntu Light is said to have a boot-up time of around seven seconds. Another difference between Ubuntu Light and the regular Ubuntu (Ubuntu Desktop, Ubutntu Netbook Edition, Ubuntu Server Edition etc.) is that Ubuntu Light is the file system. In Ubuntu Light NTFS will be used in order to allow easier data access by Windows.
Neither Canonical nor Dell has made any official announcement.