Free Engines are the new "In" thing

Not to be outdone by Unity 3D offering their basic SDK for free, the folks behind the Unreal engine have now released a free version of their development kit. I have to say, I'm reconsidering whether my next game should be in Flash or not with the tools that are out there. While selling downloadable titles is harder, there's something in me that thinks the game would look SO much better with UDK behind it...