The get* packages contain only one script of the same name. They (the script) download binary programs like Opera and Skype, and package them up, to give you a 'get' package and a working package. This means you use the 'get' package to download them, the working one to remove them.

You should have the 'get' package installed; run from the command line as root user:
get-opera
and it'll dash off and fetch Opera, and package it (and even install it) for you.

It's a bit confusing but it's because it's not a program SliTaz has generated and can't really trust/optimise etc. etc.

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The other packages which are compiled and generated by SliTaz servers are simply a case of:
tazpkg get-install [package]
tazpkg remove [package]
as you may have sussed out.

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I've also updated the docs on this as I didn't realise it wasn't explained!

HIH.

Thanks Seawolf