You must have a certain website or subset of the community in mind. I actually got a Kindle 3 a couple months ago and the majority of the discussion that I could find about homebrew on the device was centered around removing the ads. I browsed 4 or 5 forums before deciding it was a lost cause.

In fact, I wasn't even really able to find anything other than removing the ads and changing the screensaver as what you can do after your kindle is jailbroken.