So you looked down the Raspberry Pi spec sheet but weren't happy they didn't include an FM transmitter? No worries! I found it's possible to transmit FM using the clock generator built into the broadcom chipset. Just hook up a bit of wire as an antenna, and you're good to go.
Code and examples and a mini-explanation of how it works are to be found here:
Google Chrome Dev channel recommended. Firefox, Safari work but with bugs. Give the link to your friends, but don't post it on digg/reddit etc. because the server can only handle about 30 people at a time right now. In return, you must send me an email with comments or suggestions, particularly if you've tried to make a game.
The 00:07 on Sunday evenings to Cambridge on the other hand is a different story. For one thing, it seems to be free, because the ticket barriers are open, and hence you get to keep your ticket for later use, provided it's still valid of course. That isn't what makes it "fun" though.
One big aim for Extensions in any browser is to provide something which modifies the page the user is viewing. For example, one might want to highlight certain links, add spellcheck, block flash, block ads, or implement parental controls.
The "content scripts" part of Googles extension system is designed specifically for this, but there is one large flaw - A content script can't modify page content on the fly as it's loaded.