The core concept behind Portal involves bending the space/time continuum, but is Aperture Laboratories actually capable of reversing Valve Time? Possibly, as Kotaku points to clues from the Valve PotatoFoolsDay ARG suggesting Portal 2 may be released on Friday, rather than next week (thanks nin). On a semi-related note, Portal 2 pre-loads are now available through Steam. Also, on the topic of Valve Time, Brad Wardell tells IndustryGamers he thinks operating Steam is contributing to delays of Valve's internally developed games, saying: "you look at before Steam and after Steam, it's definitely had an effect." Of course Half-Life, the poster child for Valve Time, was released years before Steam was a gleam in Valve's eye, but he's entitled to his opinion. Finally, there's more on this ARG on the Dejobaan Website (where they offer this mash-up) and the Lazy 8 Website.