If you've yet to sample the delights of Guild Wars 2, ArenaNet are about to give you two good reasons to set foot into Tyria. Starting this Friday (27th September), you'll be able to play the colourful MMORPG for free for an entire week, ending on October 4th. If you like what you play, the full game will be discounted from £35 to £27.99 until October 7th. Remember that Guild Wars 2 uses a buy once, play forever business model rather than monthly subs.
As someone who still logs on regularly to play the fortnightly updates (look out for Byssk on the Desolation server), I'd definitely suggest checking out the trial at the very least. £27.99 will net you a ridiculous amount of entertainment, even if you play much of it solo.