I have a Toshiba R100 notebook which doesn't have CDROM drive. It'll be troublesome to try Ubuntu in it using methods in Pendrivelinux via USB thumb drive so I might try Wubi which is called Easiest Way to Linux.
Wubi enables you to install and try Ubuntu like a typical Application in Windows, i.e. you can see it in Add/Remove program in Windows Control Panel. If I'm happy it then I could transfer the installation using LVPM thereby without the use of a CDROM drive.