This is, outside of The Star Wars, the only piece of non-movie content I’ve ever actually gotten into. And although it’s no longer canon, it’s still a very satisfying read.
Dark Empire is probably my favourite Star Wars story outside of the original trilogy. There’s a nice long article on Marvel about the series – which you should probably not read if you want to avoid spoilers. Instead, scroll down to the end for the Marvel Unlimited links that will let you read Dark Empire. Or just go directly here. I’m pretty sure you’ll find it worth your while.