You can find that version here. It's something that couldn't have been done years ago, but with modern browsers (and remembering the fact that we're talking 20 year graphics and gameplay here), it's easily done.
In addition, for one day only, today, Wolfenstein 3D is available in the App Store for free. This version also includes the Spear of Destiny Add-On that was released in Sept. of 1992, just a few months after the original release. Sadly, not only does the app return to its $1.99 price tomorrow, there is no Android version, and the web-based version doesn't appear to run on Android (at least, on devices we tried).
Meanwhile, a close-to 30 minute developer commentary track from industry legend John Carmack has been released to YouTube. It explores his memories from the early days of id Software, the original developers / publishers of the game.
It's interesting to listen to Carmack speak of the glory days of PC gaming. However, id Software is no longer the leader it once was. Rumors are that after last year's disappointing "Rage" launch, Doom 4 has been put on hold, or at least considered "in trouble."
There's no dismissing the role that Wolfenstein 3D, as well as its protagonist, William "B.J." Blazkowicz had in PC gaming, and gaming overall, though.
Watch Carmack's 20th anniversary video below.