One good example is uTorrent.
They have a Standalone and an Installer version.
For the computer savvy people it's a no brainer: we prefer standalone versions because, like bugmenot said, they don't install all over the computer (system folder, registry, program files folder, etc.).
Hell, I wished ALL apps were standalone instead of installer crap that fools around with system files and registry entries. :evil:
But most other people (the non-computer savvy) are used to installers that do everything for them, by simply double-clicking an .exe file. Some of these people don't even know that programs can run without being installed at all...
If they come across a .rar file, they will probably think: "What do I do with this? How do I install the program?".
Or even better: "How do I UNinstall? I can't see it in my 'Add/Remove Programs' panel!"
(BTW, I think it should be .zip instead of .rar because Windows XP can natively open .zip files. Unless you want to keep the super-newbies away! :lol:)
These are the people for which an installer is useful and needed.
But then again, if they don't know what a standalone app is, and how it works, they probably won't be into Usenet, binaries and alt.binz.