HP seemed to have "lost" David Barzelay's laptop when he sent it in for repairs. After a month of no laptop, HP wouldn't replace it or return it.

So David filed suit against them in small claims court. Without even contesting it, HP sent him a brand-spanking new laptop. All it cost David was $14 in filing fees.

Small claims court. Use it. It's for you, it's easy, it's awesome. Here's a list of states and info about filing such a claim.

I'm A Plaintiff and I Win! Me: 3, HP: 1 [Barzelay.net] (Thanks to Brian!)