Opera 11.1 final released with Opera turbo by adding support for Google image format WebP and loads sites faster on slower connections with better image quality, enhanced Speed Dial with Auto zooming allows to add unlimited number of dials, if you are looking for Portable version of Opera 11.1 final here it is.
Opera 11.1 portable offers same functionality as that of desktop version, no data will be saved to your Computer you’re browsing from. You can download and extract the file to hard drive or your USB flash drive.
Download Opera 11.1 portable from here.