Minecraft is still a very popular sandbox game if the Notch's sales numbers are to be believed, raking up sales of a hundred copies or more every day. Fans have been posting tons of mods for the game, but this Portal texture pack (clip featured above) is probably high on every Minecraft owner's request list. You might recognize the obvious nods to Valve's highly-acclaimed game, portals work both ways, and it even has a cameo from an old friend.

As pointed out by Joe Larson in this Bytejacker post, it would have been cooler to be able to view into a portal to see the other side, but don't rule that option out yet since Markus himself is a very capable coder and he could make it work if he wants to.

The Portal texture pack thread is here, and more mods can be found here. (source: Bytejacker)