The last download pack for Trials HD was well worth the money, if you could handle, uh, stressful situations. Taking it many steps further is the just-announced "Big Thrills" add-on, which will introduce us to 40 new levels when it hits during the last quarter of this year.
Additionally, RedLynx will include ten user-made levels by way of a contest that's being held right now. They've set up a website with details on how to enter and what's in store for the winners (hint: cash prizes) over here.
Other than "yes please," what else needs to be said? I suppose I should be on the lookout for another Xbox 360 controller for when I inevitably break my current one out of pure nerd anger.