Opera 10 with Qt4 on Debian Lenny
Opera uses Qt3 interface by default. I didn't find it disturbing, just until when I installed Opera 10 on my workstation today. It seems like there's some kind of bugs or problems with the configuration file, which makes the interface looks really ugly and runs incredibly slow.
My solution was to install the Qt4 version of Opera, and here is a simple step-by-step guide:
Download Opera
Look for the newest version of Opera on it's FTP archive. If you have no clues which version you should download, you probably need this version.
Install Opera
First you need to remove the previous version of opera, if you have one.
Now go to the directory where you downloaded your opera and install it using dpkg.
Change opera_10.00.4585.gcc4.qt4_i386.deb to the name of the file you downloaded.
If it asks for the replacement of the configuration, simply say no since you don't want to set everything up again. But if it doesn't work try to reinstall it and now have the configuration file replaced as well.
That's all. This could be the easiest how-to I've ever written in my life though.