The last time I played AaaaaAAaaaAAAaaAAAAaAAAAA!!! - A Reckless Disregard for Gravity was during the weekend-devouring Valve PotatoFoolsDay ARG some many months ago. Developer Dejobaan Games is still keen on the Independent Games Festival finalist; it's come out with a "semi-sequel."
Among other things, AaaaaAAaaaAAAaaAAAAaAAAAA!!! for the Awesome remasters the original 82 levels and throws in 43 new ones for good measure. Those added environments, by the way, are quite daunting. Learn from my misfortune -- don't dive into them without warming up first.
In the spirit of rampant consumerism, the PC/Mac-compatible Steam version can currently be purchased for $6.69. (It will regularly go for $9.99.) If you are new to this particular brand of base jumping, now would be the time to try it out.