[Qt-creator] where should I install Qt Creator / Qt SDK, on Linux?

[Elfen]

Pardon the complete Linux newbie question...  But what's the best place to
install Qt SDK / Qt Creator on Linux (openSUSE KDE, Ubuntu GNOME, etc)?

I downloaded qt-sdk-linux-x86_64-opensource-2010.02.bin, did chmod, then
opened the file...  The default folder is /home/[user name]/qtsdk-2010.02,
but this seems strange?

My general understanding is that there are two basic types of installs:
1) the automatic package repository installs
2) installs you do manually, such as from deb / rpm / bin files

Meanwhile, I notice that the openSUSE package repository's latest firefox is
3.5.9, yet FireFox's website lets me download version 3.6.3.

I am finding Linux to be strange compared to Windows and Mac, but probably
that will go away with more experience O:-)

thank you for any leads
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