Opera 11.60.1147 Beta & 12.00.1116 Alpha & 11.52.1100 Final Multilingual

Fast and free Web browser without installation.
Download Portable Opera Alpha Online from MegaUpload (0.4 MB)
Download Portable Opera Beta Online from MegaUpload (0.4 MB)
Download Portable Opera Final Online from MegaUpload (0.4 MB)

Extract and run OperaPortable.
Edit OperaPortable.ini to choose Open & Save Dir, not empty cache, not backup icons & thumbnails...
Settings of installed Opera should be preserved.

Results in Acid3 Test: 100 %