Apparently PH101 Logic is the easiest option ever. Languages also get high results. The most popular (amongst Econ students i think) is AC100 Elements of Accounting and Finance which is easy but quite boring.
They count most towards your degree in the 2nd or 3rd year since each module makes up 1/9th of your final degree, whereas in the 1st year they take the average of your top 3 modules to equal 1/9th.
I'm thinking of doing either a language or EH101 The Internationalisation of Economic Growth, because it sounds really interesting and the lecturer is apparently really good.