I would grab a few kilos of lemons, a couple of bars of zinc and another couple of copper and build a couple of batteries.

Then I'd peal the cables and attatch them to the bars, and voilá!

1830
1835
Settlers of Catan
Civilization (1980 version)
Carcassonne
Age of renaissance
Dune

A good chunk of my designs are here:

http://boardgamegeek.com/boardgamedesigner/8933/richard-hutnik

No it is not /thread, because the context I am giving you here is the scenario from Revolution, the NBC series.  NO electrical devices work, period.  It doesn't matter if they are on the grid or not, something happened to kill elecrticity as an invention.  So your Gameboy is now dead.  However, boardgames and cardgames will still work.  Anything not requiring electricity will work.

It is in my sig below, and I also posted a link to it:

http://boardgamegeek.com/boardgamedesigner/8933/richard-hutnik

In regards to Puerto Rico, arguably my favorite tabletop game, I am currently playtesting a variant of the pie rule applied to role selection in Puerto Rico (and turn order), so that seating order is irrelevant, and players don't start out with corn or indigo.  I have been posting iterations of the game designs in my blog on Boardgame Geek.

In that case I will play poker and monopoly. 

Do you want to lose your sanity due to to boredom?  W.W.B will do this.  W.W.B stands for World's Worst Boardgame for a reason.  It represents about everything you can do wrong in a game design.

Any board game: Risk, because it lasts for hours and you never get bored of it.

One of yours: Crossing Stonehenge, because it's the highest rated and I'm not about to research the premises of 70-odd board games.

If you like Risk, take a look at Risk Legacy:

http://boardgamegeek.com/boardgame/105134/risk-legacy

As far as Crossing Stonehenge, you can't go by the rating.  I shilled the game to a 10 level for giggles on there.  Since no one else rated it, that would be the case.  It is good though.  Linebreakers is similar, but uses chess pieces and a regular chess board.

Designs of note by me though would be:
Simultaneous Captain's Mistress, which was said to make Connect Four "almost playable" by those who don't like Connect Four.

Oneonta Whist, for those who want a trick-taking card game that is playable solitaire, with 2 or more, and even cooperatively.

I also have a number of chess variants I did, which are of note.

Risk Legacy costs more than double what Risk does. £40 is ridiculously expensive for a board game.

Simultaneous Captain's Mistress sounds interesting and has the bonus of being available online, so I'll try that out.