I think all of them are okay, they just try to scare u. I activate extra-devel and i install a bunch of cool programs and nothing wrong with them.

Some of the must have program like....qtirreco, FM radio, Maemo Mapper, Knots2, OpenArena, ScummVM, Pidgin Internet, recorder, VNC viewer. I can actually RECORD FM RADIO w/ "RECORDER"..wow!! And then i can set it as my ring tone. I can use qtirreco to control my TV....amazing! I can use Knots2 to stream ANY VIDEO IN ANY FORMAT on the phone...amazing. And Open Arena and ScummVM are amazing games with awesome graphics. I can use VNC viewer to look at my PC and interact with it like i am @ the pc (though i wasn't too fond of it).

And then of course there is NES, SNES, SEGA, VGBA emulators.