If you configure Apache to serve Perl-scripts via mod_perl, and you get an “500 Internal Server Error” each time you access a perl script, you might want to check the first line in the script.
#!/perl/bin/perl.exe
Is what you can find, but…is that where you installed perl? I didn’t! So change the line to point to the correct location of perl.exe (#!c:/progra~1/perl/bin/perl.exe) and try the script again. It worked for me.
Qt from Trolltech had a dual-license since its beginning, but not for Windows. If you wanted to use Qt on Windows, you had to buy a commercial license, even if you were creating an open-source application. This has changed today, as you can read in this press-release.
Qt is a C++ application framework, and having that on Windows, Linux, HP-UX, AIX, Mac OS/X and some other operating systems means that you can write an application that compiles to NATIVE code without recoding. But the guys from Trolltech can convince you better than I can, so read more about Qt here.