Just ingame or can we count real life... oh wait crap! I mean, umm ingame of course! You can't blow up planets for realsies of course, what was I saying...

*slinks out when no one is looking*

I haven't blown up a planet, but planetary bombardment and utter destruction? Sure. Spintir is now just a bunch of burned out forests, some mountains and not much else... sort of like a Taris incidident.

In my campaign, Endor was completely laid to waste by the destruction of the second Death Star (though this happened three years before the campaign began). This served not only to remove several canonical characters from existence (so as not to overshadow the PC's and their endeavors) but it also shook the Rebellion to its core; laying the foundation for the current political realities of the campaign.

I still believe that Episode 7 had this concept on the table at one point. Jakku originated as a partially destroyed Endor battle scape in my opinion (due to hints supplied while Googling during its development).

OFF-TOPIC: I might have preferred this over another desert planet? It at least sounds cool at first. The idea of the Rebels inadvertently causing such destruction on those poor little teddy bears would have been a nice gray in place of the usual black and white of Star Wars. But, upon further exploration there would have been issues for me: 1) It's a big universe but yet again we are re-using a planet ala Tattooine, and 2) Why would Rey and many other non-Ewoks be on Endor to make the rest of the plot work? I don't think I would have liked Rey to be a clichéd raised-by-wolvesEwoks character. Or, a rehash of Stormtroopers destroying a poor Ewok village other then the awesomeness of teddy bears being set afire by the First Order's new flametroopers.

OFF-TOPIC: I might have preferred this over another desert planet? It at least sounds cool at first. The idea of the Rebels inadvertently causing such destruction on those poor little teddy bears would have been a nice gray in place of the usual black and white of Star Wars. But, upon further exploration there would have been issues for me: 1) It's a big universe but yet again we are re-using a planet ala Tattooine, and 2) Why would Rey and many other non-Ewoks be on Endor to make the rest of the plot work? I don't think I would have liked Rey to be a clichéd raised-by-wolvesEwoks character. Or, a rehash of Stormtroopers destroying a poor Ewok village other then the awesomeness of teddy bears being set afire by the First Order's new flametroopers.

I think the way I would have done that is that Endor got turned into Jakku as a result of the war, the firebombing, and such that the orbit of the planet changed and thus so did the whole ecology. No Ewoks or other indigenous life forms would have survived.

Not quite an Alderaan scale destruction, but in some ways almost more terrifying.

I had a plot where this Imperial admiral was trying to destroy Nar Shaddaa to bring the Hutts into line. Luckily the PCs stopped him. That said, I do have a list of planets to, if not outright destroy at least depopulate.

In an alternate timeline KOTOR era campaign we did, the players ended up destroying Naboo. The players brought down this colossal orbital facility down on the planet, and they were pretty much at the centre of the impact zone, so they didn't make it out. That said, they did successfully eliminate the Gungan plague.

I have never destroyed a planet, but as for Nar Shadaa I have already thought about how to do it. I am planing on having my PCs involved in the smugglers revolt (moved in the time line) and if they fail... well...

In Lords of Nal Hutta There is a section on Nar Shadaa (I don't have the book in front of me so I don't know the details), all of the life supporting systems; air cleaners, waste removal, power, water, ect are on the lowest levels. Theses haven't been properly maintained for over a century and are at about 60% efficiency. A catastrophic failure (or sabotage) would make the planet uninhabitable or worse.